9 Finger Facts
Which hand represents the TENS?
Left hand
Can a helper fact be larger or smaller than the problem?
BOTH
Ex: 6x7=?
helper facts: 5x7 or 7x7
Solve 6x5=? using doubling.
5x3=15
5x3=15
15+15=30
Use the 9 fingers facts to solve this problem:
9x7=?
63
If I use 5x8=40 to solver the following problem: 7x8=?
What do I do in order to find my final answer?
add the number 8 TWO more times
40+8=48
48+8=56
Use doubling to solve 8x11=?
4x11=44
4x11=44
44+44=88
Which 9 multiplication facts does the finger trick NOT work on?
9x11 and 9x12
Choose a helper fact to answer the following problem"
6x9=?
Answers vary:
5x9=45
6x10=60
Use doubling to solve 8x9=?
4x9=36
4x9=36
36+36=72
Use the 9 finger facts to solve the problem:
9x9=?
81
Alex used a helper fact to solve the following problem: 7x8=?
7x10=70
70-8=62
62-8=54
Is he correct?
No, he should have subtracted 7
70-7=63
63-7=56
The correct answer is 56
Solve 6x8=? using doubling
SOLVE BOTH WAYS
3x8=24 6x4=24
3x8=24 6x4=24
24+24=48 24+24=48