|
|
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
|
1 |
1*1=1 |
1*2=2 |
1*3=3 |
1*4=4 |
1*5=5 |
1*6=6 |
1*7=7 |
1*8=8 |
1*9=9 |
1*10=10 |
|
2 |
2*1=2 |
2*2=4 |
2*3=6 |
2*4=8 |
2*5=10 |
2*6=12 |
2*7=14 |
2*8=16 |
2*9=18 |
2*10=20 |
|
3 |
3*1=3 |
3*2=6 |
3*3=9 |
3*4=12 |
3*5=15 |
3*6=18 |
3*7=21 |
3*8=24 |
3*9=27 |
3*10=30 |
|
4 |
4*1=4 |
4*2=8 |
4*3=12 |
4*4=16 |
4*5=20 |
4*6=24 |
4*7=28 |
4*8=32 |
4*9=36 |
4*10=40 |
|
5 |
5*1=5 |
5*2=10 |
5*3=15 |
5*4=20 |
5*5=25 |
5*6=30 |
5*7=35 |
5*8=40 |
5*9=45 |
5*10=50 |
|
6 |
6*1=6 |
6*2=12 |
6*3=18 |
6*4=24 |
6*5=30 |
6*6=36 |
6*7=42 |
6*8=48 |
6*9=54 |
6*10=60 |
|
7 |
7*1=7 |
7*2=14 |
7*3=21 |
7*4=28 |
7*5=35 |
7*6=42 |
7*7=49 |
7*8=56 |
7*9=63 |
7*10=70 |
|
8 |
8*1=8 |
8*2=16 |
8*3=24 |
8*4=32 |
8*5=40 |
8*6=48 |
8*7=56 |
8*8=64 |
8*9=72 |
8*10=80 |
|
9 |
9*1=9 |
9*2=18 |
9*3=27 |
9*4=36 |
9*5=45 |
9*6=54 |
9*7=63 |
9*8=72 |
9*9=81 |
9*10=90 |
|
10 |
10*1=10 |
10*2=20 |
10*3=30 |
10*4=40 |
10*5=50 |
10*6=60 |
10*7=70 |
10*8=80 |
10*9=90 |
10*10=100 |
|
Twin facts: because of the commutative law, once you know one of the pair of twin facts, you know both of them. In other words, a*b = b*a for any numbers a and b. Example: 7*9 = 9*7 = 63 |
||||||||||
|
Times 10: to multiply a whole number by 10, write an extra zero at the end of the number. Example: 5*10 = 50 |
||||||||||
|
Times 1: to multiply a number by 1, do nothing. Example: 8*1 = 8 |
||||||||||
|
Times 9: To multiply a number by 9, multiply it by 10 and subtract the number. Or use your hands. Example: 9*7 = 10*7 - 7 = 70 - 7 = 63
To do it on hands, bend finger #7 from the left. There are six fingers to the left of the bent finger, and three fingers to the right. So we have 9*7=63 |
||||||||||
|
Times 5: To multiply a number by 5, multiply a half of that number by 10. Example: 5 times 8 is the same as four 10s, or 40, so 5*8 = 40 |
||||||||||
|
Times 2: to multiply a number by two, add it to itself. |
||||||||||
|
Off diagonal: To multiply numbers that differ by two, multiply the number between them by itself and subtract one. Example: 6*8 = 7*7 - 1 = 48 |
||||||||||
