Fact Families
Find the unknown value
? x 7 = 28
The unknown value is 4
If you multiply 7 x 5, will the product be odd or even? Explain why
Odd, because both numbers are also odd
Molly has 3 buckets with 4 apples in each bucket. How many apples does she have in all?
Molly has 12 apples because 4 x 3 = 12
Draw an array for the equation 5 x 6
5 rows, 6 columns
or
6 rows, 5 columns
Write an equation using the Commutative Property for: 8 x 9
9 x 8
Write the fact family for 3, 9, and 27
3 x 9 = 27
9 x 3= 27
27 / 9 = 3
27 / 3 = 9
If you multiply 5 x 2 , will the product be odd or even? Explain why
Eric spends $30 on 5 batches of trail mix. How much did he spend on each batch?
Eric spent $6 on each batch because 30 / 5 = 6
THEN break it into 2 arrays
2 x 5
2 x 5
Write an equation using the distributive property for this: 8 (2 x 4)
(8 x 4) + (8 x 2)
If you have the equation 6 x 5 = 30, what are the other 3 equations?
5 x 6 = 30
30 / 6 = 5
30 / 5 = 6
If you multiply an odd number by an even number, will the product be odd or even?
Even
Sara has 21 dimes. She puts them in 3 equal stacks. How many dimes are in each stack?
There are 7 dimes in each stack because 21 / 3 = 7
There are 5 shelves at a store. There are 4 boxes of cereal on each shelf. Draw an array for this problem and solve
4 x 5
20 cereal boxes
Write this equation using repeated addition: 4 x 3
4 + 4 + 4
Write the fact family for 0 and 6
0 x 6 = 0
6 x 0 = 0
6 / 0 = 0
0 / 6 = 0
Does multiplying any number by 8 always give you an even product? Why?
Because 8 is even, so the product will be even
A baker is decorating 5 cakes. He puts 9 flowers on each cake. Write an equation using ? to represent the product.
9 x 5 = ?
Ray says that the array of 4 x 6 gets the same product of 3 x 8. Is he correct? Draw the arrays and solve
Yes, 4 x 6 = 24 and 8 x 3 = 24
Use the distributive property to break down 7 x 4 into 2 equations with this format ( ____ x ____) + (___ x ___)
(5 x 4) + (2 x 4)
12 friends went on a hike. All but 4 of them bought a water bottle. The total cost of water bottles cost $32. How much did each water bottle cost?
What do you need to solve first?
First, subtract 12 - 4 = 8. 8 friends bought waters.
Then divide 32 / 8 = $4
Each water bottle costs $4.
Think about 3 x 5
Can 3 be divided by 2?
So will the product be odd or even?
No, 3 cannot be divided by 2. So the product is odd
There are 3 games in a box. There are 2 rows of boxes. One box costs $54. How much does each game cost?
What do you need to solve first?
First, solve how many games there are: 3 x 2 = 6 games
Then divide each game by the total to get how much each game costs: 54 / 6 = 9
There are 30 cans of soup. Draw an array of how you can display the cans of soup
Array that is 5 x 6 or 10 x 3
Use the associative property to multiply these numbers together: 3 x 2 x 4
(3 x 2) x 4
6 x 4
Answer: 24