Learning multiplication by 6 and 7 Flashcards
(38 cards)
6 x 1
6
6 x 2
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
6 x 4
24
half of 4 is 2, so put a 2 in the tens column, then copy the 4 for the ones column
6 x 6
36
half of 6 is 3, so put a 3 in the tens column, then copy the 6 for the ones column
6 x 8
48
half of 8 is 4, so put a 4 in the tens column, then copy the 8 for the ones column
6 x 10
60
Anything times ten just gets a zero to the right
half of 2
1
half of 4
2
half of 6
3
half of 8
4
half of 10
5
2 ÷ 2
1
4 ÷ 2
2
6 ÷ 2
3
8 ÷ 2
4
10 ÷ 2
5
6 x 7
42
“The answer to life”
7 x 6
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
7 x 1
7
7 x 2
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
7 x 4
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
7 x 8
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
7 x 10
70
“Anything times 10 adds a zero to the right”
7 x 7
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.