Learning multiplication by 6 and 7 Flashcards

1
Q

6 x 1

A

6

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2
Q

6 x 2

A

12

a) count up in 2s, 6 times
b) half of 2 is 1, so put a 1 in the tens column, then copy the 2 for the ones column

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3
Q

6 x 4

A

24

half of 4 is 2, so put a 2 in the tens column, then copy the 4 for the ones column

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4
Q

6 x 6

A

36

half of 6 is 3, so put a 3 in the tens column, then copy the 6 for the ones column

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5
Q

6 x 8

A

48

half of 8 is 4, so put a 4 in the tens column, then copy the 8 for the ones column

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6
Q

6 x 10

A

60

Anything times ten just gets a zero to the right

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7
Q

half of 2

A

1

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8
Q

half of 4

A

2

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9
Q

half of 6

A

3

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10
Q

half of 8

A

4

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11
Q

half of 10

A

5

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12
Q

2 ÷ 2

A

1

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13
Q

4 ÷ 2

A

2

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14
Q

6 ÷ 2

A

3

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15
Q

8 ÷ 2

A

4

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16
Q

10 ÷ 2

A

5

17
Q

6 x 7

A

42

“The answer to life”

18
Q

7 x 6

A

42

a) “The answer to life”
b) half of 6 is 3 so put a 3 in the tens column, double 6 is 12 so put a 2 in the ones column and a 1 in the tens column

so 30 + 12 = 42

19
Q

7 x 1

A

7

20
Q

7 x 2

A

14

a) count up in 2s, 7 times
b) half of 2 is 1 so put a 1 in the tens column, double 2 is 4 so put a 4 in the ones column

21
Q

7 x 4

A

28

half of 4 is 2 so put a 2 in the tens column, double 4 is 8 so put an 8 in the ones column

22
Q

7 x 8

A

56

a) “Think 5 6 7 8”
b) half of 8 is 4 so put a 4 in the tens column, double 8 is 16 so put a 6 in the ones column plus one more in the tens column:

so 40 + 16 = 56

23
Q

7 x 10

A

70

“Anything times 10 adds a zero to the right”

24
Q

7 x 7

A

49

You must memorize this one. It will come back very often and is worth knowing very quickly. Take as long as you need to find a way to memorize this, but the answer needs to come to you immediately in the future.

25
Q

double 2

A

4

26
Q

double 4

A

8

27
Q

double 6

A

12

28
Q

double 8

A

16

a) Count up in 2s, 8 times
b) it takes 2 more to get to 10 since 8 and 2 are a “ten pair”, so there are 6 left to add (6 more in addition to 10 already added gives 16)

29
Q

2 x 2

A

4

30
Q

2 x 4

A

8

31
Q

2 x 6

A

12

32
Q

2 x 8

A

16

33
Q

6 x 3

A

18

6 x 3 = 6 x 2 + 6

and 6 x 2 = 12 because half of 2 is 1 and copy the 2

so…

6 x 3 = 12 + 6

6 x 3 = 18

34
Q

7 x 3

A

21

7 x 3 = 7 x 2 + 7

and 7 x 2 = 14 because half of 2 is 1 and double 2 is 4

so…

7 x 3 = 14 + 7

7 x 3 = 21

35
Q

6 x 5

A

30

count up in 5s, 6 times

36
Q

7 x 5

A

35

count up in 5s, 7 times

37
Q

6 x 9

A

54

Use 9 times table trick:

lower your 6th finger from the left

5 fingers to the left, so 5 in the tens column

4 fingers to the right, so 4 in the ones column

38
Q

7 x 9

A

63

Use 9 times table trick:

lower your 7th finger from the left

6 fingers to the left, so 6 in the tens column

3 fingers to the right, so 3 in the ones column