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Consulting Math 1 > FastMath Practice > Flashcards

FastMath Practice Flashcards

1
Q

How to multiply by 25

A

Divide by 4 then multiply by 100

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2
Q

How to divide numbers with multiples of 4 by 4?

A

Left to right, digit by digit. Ex: 84/4 –> 8/4 = 2 and 4/4 = 1, concatenate to 21

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3
Q

How to divide numbers with non-multiples of 4 by 4?

I.e. 52/4

A

I.e. 52/4 –> decompose

  • -> 40/4 = 10
  • -> 12/4 = 3
  • -> concatenate to 13

OR divide by 2 twice

52/2 = 26 –> 26/2 = 13

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4
Q

8*25

A

8÷ 4 = 2

2 *100 = 200

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5
Q

25*55

A

44 ÷ 4 =11

11*100 =1,100

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6
Q

16*25

A 
16/4 = 4
4*100 = 400
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7
Q

25*40

A 
40/4 = 10
10*100 = 1000
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8
Q

24*25

A 
24/4 = 6
6*100 = 600
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9
Q

25*60

A 
60/4 = 15
15*100 = 1500
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10
Q

320 * 25

A 
320/4 = 80
80*100 = 8000
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11
Q

25*18

A

450

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12
Q

26*25

A

26/4 = 6.5 –> 6.5*100=

650

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13
Q

25*9

A

9/4 = 2.25 –> * 100 = 225

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14
Q

17*25

A

425

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15
Q

25*900

A

22,500

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16
Q

25*800

A

20,000

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17
Q

160*25

A

4,000

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18
Q

1,200*25

A

30,000

19
Q

25*140

A 
140/2 = 70
70/2 = 35
35*100 = 3,500
20
Q

860*25

A

860/2 = 430
430/2 = 215
*100
21,500

21
Q

25*124

A

3100

22
Q

180*25

A

4,500

23
Q

25*328

A

8,200

24
Q

How to divide by 25

A

25 = 100/4, so

  1. Multiply by 4 (or multiply by 2 twice) and then divide by 100
    OR
  2. Divide by 100 and then multiply by 4
25
Q

300/25

A 
300/100 = 3
3*4 = 12

OR 300*4 = 1200
1200/100 = 12

26
Q

700/25

A 
700/100 = 7
7*4 = 28
27
Q

1,200/25

A 
1,200/100 = 12
12*4 = 48
28
Q

900/25

A 
900/100 = 9
9*4 = 36
29
Q

2,200/25

A 
2,200/100 = 22
22*4 = 88
30
Q

450/25

A

18

31
Q

750/25

A

30

32
Q

3,500/25

A

140

33
Q

6,000/25

A

240

34
Q

8,500/25

A

340

35
Q

725/25

A

29

36
Q

1,225/25

A

49

37
Q

4,500/25

A

180

38
Q

5,000/25

A

200

39
Q

3,000/25

A

120

40
Q

3200/25

A

128

41
Q

40,000/25

A

1,600

42
Q

65,000/25

A

650

43
Q

22,500/25

A

900

44
Q

7,400/25

A

296

Consulting Math 1 (31 decks)

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