Multiplication as Repeated Addition & Arrays
What is the multiplication sentence for the array below?
o o o o o o o o o
o o o o o o o o o
2 x 9
What is 2 x 9?
18
What is 5 x 5?
25
What is the Zero Property of Multiplication?
When you multiply any number and 0, the product is 0.
Steve bought 4 packs of juice. Each pack has 6 boxes in it. What number sentence can you write to solve this problem?
4 x 6 =___
What is the repeated addition sentence for 3 groups of 7?
7 + 7 +7
How can you use skip counting by 2s to solve 5 x 2?
2, 4, 6, 8, 10
Find the product of 6 and 10.
60
Compare the following multiplication sentences.
Is 3 x 0 (>, <, or =) 1 x 3
3 x 0 < 1 x 3
What is the hidden question for the following problem:
Savannah bought a package of raisins. She gave 3 boxes of raisins to each of her 2 sisters, and she had 9 boxes left over. How many boxes of raisins were in the package?
The hidden question is How many boxes of raisins did she give to her sisters?
What multiplication sentence has the same value as:
4 + 4 + 4 + 4
4 x 4
Find 4 times 9.
36
$10 x 9
$90
What does the Identity (one) Property of Multiplication?
When you multiply a number and 1, the product is that number.
Explain how you could use a table to solve a word problem?
You can use a table to enter the information you know and use that information to identify the pattern.
How would you draw an array for 5 x 8?
I would draw 5 rows with 8 in each row.
What is 8 x 9?
72
Find 7 times 5.
35
Can you write a multiplication sentence for 8 + 2 + 1? Explain why or why not.
No you cannot write a multiplication sentence because there are no equal groups.
Hillary had 2 bags of apples. Each bag had 9 apples. She gave 4 apples to her brother. How many apples does Hillary have left?
She has 14 apples left.
How to solve:
2 bags x 9 apples in each bag = 18 apples in all
18 apples - 4 apples given = 14 apples left
Use the groups to answer the following:
o o o o o o o o o o o o
4 groups of ______
___+___+___+____=12
4 x___=_____
4 groups of 3
3+3+3+3=12
4x3=12
Find 7 times 2.
14
What is $5 times 10?
$50
Austin gave 3 friends some blocks to build a tower. Each friend got 10 blocks. How many blocks were there in all?
There were 30 blocks in all.
Mr. Stokes got 4 new paintbrushes and Ms. Li got 6. Each brush cost $5. Explain what Suzy did to find out how much money they spent in all.
Suzy's Work:
6 + 4 = 10
10 x $5 = $50.
First, Suzy found out how many paint brushes Mr. Stokes and Ms. Li bought in all. Then, she multiplied the total number of paintbrushes by the cost of each paintbrush to find out how much they spent in all.