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Multiplication & Division MYSTERY!. For our BBES 3 rd Graders. Remember: if you know ONE fact in a fact family, you know the WHOLE, ENTIRE fact family!. Fact Families. Like… if you know 2 x 5 = 10. Then you know 5 x 2 = 10. and 10 5 = 2. and 10 2 = 5. Fact Families. Or. - PowerPoint PPT Presentation
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Multiplication & Division
MYSTERY!For our BBES 3rd Graders
Fact FamiliesRemember: if you know ONE fact in
a fact family, you know the WHOLE, ENTIRE fact family!
Like… if you know 2 x 5 = 10Then you know 5 x 2 = 10
and 10 5 = 2
and 10 2 = 5
Fact Families
Or
if you know 20 4 = 5
Then you know 20 5 = 4
and 5 x 4 = 20
and 4 x 5 = 20
It’s a PIECE OF CAKE!
Using what you know about fact families, figure out the number that is missing in
each number model!Write it on your white board when
you know the answer!
What number is missing?
6 x ____ = 36
What number is missing?
6 x 6 = 36
What number is missing?
____ x 4 = 12
What number is missing?
3 x 4 = 12
What number is missing?
9 ____ = 3
What number is missing?
9 3 = 3
What number is missing?
7 x ____ = 49
What number is missing?
7 x 7 = 49
What number is missing?
9 x ____ = 27
What number is missing?
9 x 3 = 27
What number is missing?
56 ____ = 7
What number is missing?
56 8 = 7
What number is missing?
5 x ____ = 40
What number is missing?
5 x 8 = 40
What number is missing?
10 ____ = 2
What number is missing?
10 5 = 2
What number is missing?
3 x ____ = 24
What number is missing?
3 x 8 = 24
What number is missing?
81 ____ = 9
What number is missing?
81 9 = 9
What number is missing?
2 x ____ = 20
What number is missing?
2 x 10 = 20
What number is missing?
18 ____ = 3
What number is missing?
18 6 = 3
What number is missing?
12 x ____ = 144
What number is missing?
12 x 12 = 144
What number is missing?
32 ____ = 8
What number is missing?
32 4 = 8
What number is missing?
10 x ____ = 50
What number is missing?
10 x 5 = 50
What number is missing?
8 ____ = 8
What number is missing?
8 1 = 8
Now look at the number model given on each of the next slides. Write the three number models that are in
the same fact family as those equations.
What equations complete the fact family?
7 x 3 = 21
____ x ____ = _____
____ ____ = _____
____ ____ = _____
What equations complete the fact family?
7 x 3 = 213 x 7 = 21
21 7 = 3
21 3 = 7
What equations complete the fact family?
18 9 = 2
____ ____ = _____
____ x ____ = _____
____ x ____ = _____
What equations complete the fact family?
18 9 = 218 2 = 9
2 x 9 = 18
9 x 2 = 18
What equations complete the fact family?
4 x 2 = 8
____ x ____ = _____
____ ____ = _____
____ ____ = _____
What equations complete the fact family?
4 x 2 = 82 x 4 = 8
8 2 = 4
8 4 = 2
What equations complete the fact family?
3 x 11 = 33
____ x ____ = _____
____ ____ = _____
____ ____ = _____
What equations complete the fact family?
3 x 11 = 3311 x 3 = 33
33 11 = 3
33 3 = 11
Way to go!!!
