Learn immediately Flashcards

1
Q

How to multiply by 12.5%

A

Divide by 8

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2
Q

How to multiply by 2.5%

A

Divide by 40 (divide by 10 then by 4 or reverse)

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3
Q

How to multiply by 0.5%

A

Divide by 200 (divide by 100 then by 2 or reverse)

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4
Q

How to multiply by 0.1%

A

Divide by 1000

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5
Q

How to multiply by 33%

A

Divide by 3

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6
Q

How to multiply by 16.6%

A

Divide by 6 (by 3 then by 2)

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7
Q

16% of 25M

A

4M (percentage swap –> 25% of 16 since 25 is a clean number and 16 isn’t)

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8
Q

12% of 50B

A

6B (percentage swap to do 50% of 12B)

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9
Q

28% of 50M

A

14M (percentage swap)

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10
Q

45% of 120M

A

54M (half and swap)

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11
Q

How to multiply by 5%

A

Multiply by 2, then divide by 10 (or reverse order)

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12
Q

How to multiply by 50

A

Divide by 2, multiply by 100

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13
Q

How to multiply by 500

A

Divide by 2, multiply by 1000

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14
Q

How to multiply by 2.5

A

Divide by 4 then multiply by 10

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15
Q

How to multiply by 250

A

Divide by 4, multiply by 1000

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16
Q

How to multiply by 2.5%

A

Divide by 4, then divide by 10

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17
Q

Two methods for multiplying by .75

A

Method 1:
n/4 then multiply by 3

Method 2:
Subtract 1/4 of n from n

(b/c factorization is 3/4 * 10)

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18
Q

How to multiply by 7.5

A

Subtract a 1/4 of n from n, then multiply by 10

b/c factorization is (3/4 *10

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19
Q

How to multiply by 75

A

Subtract a 1/4 of n from n, then multiply by 100

b/c factorization is 3/4 * 100

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20
Q

How to multiply by 750

A

Subtract 1/4 of n from n, then multiply by 1000

b/c factorization is 3/4 *1000

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21
Q

How to multiply by 0.075

A

Subtract 1/4 of n from n, then divide by 10

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22
Q

How to multiply by 1.5

A

( N/2 + N )

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23
Q

How to multiply by 15

A

( N/2 + N ) * 10

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24
Q

How to multiply by 150

A

( N/2 + N ) * 100

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25
Q

How to multiply by 1500

A

( N/2 + N ) * 1000

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26
Q

How to multiply by .15 or 15%

A

( N/2 + N ) / 10

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27
Q

86 * 0.15

A

12.9

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28
Q

4 * 15

A

60

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29
Q

21 * 150

A

3150

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30
Q

56 * 1500

A

84000

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31
Q

42 * 1.5

A

63

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32
Q

29 * 0.15

A

4.35

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33
Q

46 * 15

A

690

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34
Q

30 * 150

A

4500

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35
Q

5 * 1500

A

7500

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36
Q

72 * 1.5

A

108

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37
Q

21 * 0.15

A

3.15

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38
Q

96 * 15

A

1440

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39
Q

17 * 150

A

2550

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40
Q

79 * 1500

A

118500

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41
Q

6 * 1.5

A

9

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42
Q

45 * 0.15

A

6.75

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43
Q

85 * 15

A

1275

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44
Q

68 * 150

A

10200

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45
Q

35 * 1500

A

52500

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46
Q

7 * 1.5

A

10.5

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47
Q

5 * 0.15

A

0.75

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48
Q

85 * 15

A

1275

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49
Q

93 * 150

A

13950

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50
Q

4 * 1500

A

6000

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51
Q

57 * 1.5

A

85.5

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52
Q

93 * 0.15

A

13.95

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53
Q

58 * 15

A

870

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54
Q

60 * 150

A

9000

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55
Q

49 * 1500

A

73500

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56
Q

9 * 1.5

A

13.5

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57
Q

31 * 0.75

A

23.25

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58
Q

75 * 7.5

A

562.5

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59
Q

85 * 75

A

6375

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60
Q

37 * 750

A

27750

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61
Q

87 * 7500

A

652500

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62
Q

12 * 0.75

A

9

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63
Q

35 * 7.5

A

262.5

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64
Q

17 * 75

A

1275

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65
Q

30 * 750

A

22500

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66
Q

17 * 7500

A

127500

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67
Q

33 * 0.75

A

24.75

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68
Q

50 * 7.5

A

375

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69
Q

50 * 75

A

3750

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70
Q

15 * 750

A

11250

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71
Q

89 * 7500

A

667500

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72
Q

28 * 0.75

A

21

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73
Q

20 * 7.5

A

150

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74
Q

4 * 75

A

300

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75
Q

88 * 750

A

66000

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76
Q

26 * 7500

A

195000

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77
Q

46 * 0.75

A

34.5

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78
Q

21 * 7.5

A

157.5

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79
Q

31 * 75

A

2325

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80
Q

14 * 750

A

10500

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81
Q

45 * 7500

A

337500

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82
Q

83 * 0.75

A

62.25

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83
Q

61 * 7.5

A

457.5

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84
Q

71 * 75

A

5325

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85
Q

12 * 750

A

9000

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86
Q

48 * 7500

A

360000

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87
Q

29 * 0.75

A

21.75

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88
Q

44 * 7.5

A

330

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89
Q

13 * 75

A

975

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90
Q

30 * 750

A

22500

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91
Q

24 * 7500

A

180000

92
Q

85 * 0.25

A

21.25

93
Q

23 * 0.025

A

0.575

94
Q

82 * 25

A

2050

95
Q

50 * 2.5

A

125

96
Q

6 * 250

A

1500

97
Q

20 * 2500

A

50000

98
Q

43 * 0.25

A

10.75

99
Q

64 * 0.025

A

1.6

100
Q

89 * 25

A

2225

101
Q

5 * 2.5

A

12.5

102
Q

13 * 250

A

3250

103
Q

72 * 2500

A

180000

104
Q

72 * 0.25

A

18

105
Q

38 * 0.025

A

0.95

106
Q

52 * 25

A

1300

107
Q

7 * 2.5

A

17.5

108
Q

58 * 250

A

14500

109
Q

43 * 2500

A

107500

110
Q

18 * 0.25

A

4.5

111
Q

51 * 0.025

A

1.275

112
Q

74 * 25

A

1850

113
Q

68 * 2.5

A

170

114
Q

42 * 250

A

10500

115
Q

38 * 2500

A

95000

116
Q

14 * 0.25

A

3.5

117
Q

86 * 0.025

A

2.15

118
Q

63 * 25

A

1575

119
Q

77 * 2.5

A

192.5

120
Q

85 * 250

A

21250

121
Q

7 * 2500

A

17500

122
Q

74 * 0.25

A

18.5

123
Q

78 * 0.025

A

1.95

124
Q

55 * 25

A

1375

125
Q

46 * 2.5

A

115

126
Q

63 * 250

A

15750

127
Q

64 * 2500

A

160000

128
Q

36 * 0.5

A

18

129
Q

38 * 0.05

A

1.9

130
Q

51 * 5

A

255

131
Q

82 * 50

A

4100

132
Q

40 * 500

A

20000

133
Q

73 * 5000

A

365000

134
Q

86 * 0.5

A

43

135
Q

85 * 0.05

A

4.25

136
Q

14 * 5

A

70

137
Q

7 * 50

A

350

138
Q

24 * 500

A

12000

139
Q

9 * 5000

A

45000

140
Q

64 * 0.5

A

32

141
Q

74 * 0.05

A

3.7

142
Q

63 * 5

A

315

143
Q

35 * 50

A

1750

144
Q

7 * 500

A

3500

145
Q

87 * 5000

A

435000

146
Q

70 * 0.5

A

35

147
Q

82 * 0.05

A

4.1

148
Q

9 * 5

A

45

149
Q

43 * 50

A

2150

150
Q

25 * 500

A

12500

151
Q

8 * 5000

A

40000

152
Q

61 * 0.5

A

30.5

153
Q

51 * 0.05

A

2.55

154
Q

46 * 5

A

230

155
Q

35 * 50

A

1750

156
Q

83 * 500

A

41500

157
Q

58 * 5000

A

290000

158
Q

38 * 0.5

A

19

159
Q

57 * 0.05

A

2.85

160
Q

49 * 5

A

245

161
Q

86 * 50

A

4300

162
Q

12 * 500

A

6000

163
Q

28 * 5000

A

140000

164
Q

24 * 0.5

A

12

165
Q

17 * 0.05

A

0.85

166
Q

59 * 5

A

295

167
Q

51 * 50

A

2550

168
Q

62 * 500

A

31000

169
Q

80 * 5000

A

400000

170
Q

60 * 0.5

A

30

171
Q

19 * 0.05

A

0.95

172
Q

75 * 5

A

375

173
Q

86 * 50

A

4300

174
Q

55 * 500

A

27500

175
Q

82 * 5000

A

410000

176
Q

19 * 0.5

A

9.5

177
Q

88 * 0.05

A

4.4

178
Q

44 * 5

A

220

179
Q

60 * 50

A

3000

180
Q

57 * 500

A

28500

181
Q

12 * 5000

A

60000

182
Q

38 * 0.5

A

19

183
Q

69 * 0.05

A

3.45

184
Q

53 * 5

A

265

185
Q

31 * 50

A

1550

186
Q

23 * 500

A

11500

187
Q

6 * 5000

A

30000

188
Q

15 * 10

A

150

189
Q

14 * 11

A

154

190
Q

15 * 13

A

195

191
Q

13 * 13

A

169

192
Q

12 * 8

A

96

193
Q

13 * 12

A

156

194
Q

14 * 8

A

112

195
Q

13 * 14

A

182

196
Q

12 * 13

A

156

197
Q

12 * 7

A

84

198
Q

14 * 15

A

210

199
Q

12 * 9

A

108

200
Q

14 * 10

A

140

201
Q

15 * 18

A

270

202
Q

12 * 12

A

144

203
Q

15 * 12

A

180

204
Q

11 * 12

A

132

205
Q

13 * 7

A

91

206
Q

12 * 14

A

168

207
Q

13 * 8

A

104

208
Q

14 * 14

A

196

209
Q

13 * 9

A

117

210
Q

12 * 10

A

120

211
Q

13 * 15

A

195

212
Q

14 * 12

A

168

213
Q

15 * 11

A

165

214
Q

12 * 11

A

132

215
Q

12 * 15

A

180

216
Q

13 * 11

A

143

217
Q

15 * 9

A

135

218
Q

14 * 7

A

98

219
Q

14 * 9

A

126

220
Q

15 * 7

A

105

221
Q

15 * 8

A

120

222
Q

15 * 14

A

210

223
Q

15 * 15

A

225

224
Q

13 * 10

A

130

225
Q

14 * 13

A

182

226
Q

15 * 16

A

240