Simple Multiplication
Equations
Estimations
Do you agree?
Number Tables
100
6 x 4
24
100
A cat is 20 cm tall. The tree is about 4 times taller than the cat. If h represents the height of the tree, which equation represents this situation?
a. 4 x h = 20
b. 20 - h = 4
c. 4 + 20 = h
d. 4 x 20 = h
d. 4 x 20 = h
100
If the dark blue fish is 4 inches long, how long is the pink fish? Explain your thinking!
About 12 inches because the pink fish looks like its about 3 times longer than the dark blue fish.
3 x 4 = 12
100
Jared says, "I found 4 x 6 is 24 because I doubled from 2 x 6 = 12". Is Jared correct? Explain using words numbers or pictures.
Yes
2 groups of 6 plus 2 groups of 6 is the same as 4 groups of 6. Doubling in this case is correct.
100
What number goes in the blank box on the LEFT table?
9
36
9 x 3=27
9 x 4=36
200
7 x 8
56
200
TRUE OR FALSE
3 x 7 = 4 x 6
FALSE
200
If the medium pumpkin is 8 inches tall, about how tall is the large pumpkin? Show your thinking.
About 16 inches long because the large pumpkin looks like it's about double the size of the medium one.
8 x 2 = 16
200
Robbie says, "I know 5 x 3 = 8." Is he correct? Show your work using pictures, numbers, or words.
No, he is not. 5 x 3 = 15. Robbie was doing addition when he should have been multiplying.
200
What number goes in the blank box on the RIGHT table.
36
300
4 x _____=20
5
300
TRUE OR FALSE
3 x 5 = 5 x 3
TRUE
300
If the Squirrel is 3 inches tall, how tall is the bear?
About 15 inches tall because the bear looks like it's 5 times bigger than the bear.
3 x 5 = 15
300
Marcus is going to multiply 6 x 7. He said, "If I find out what 5 x 7 is, I can add one group of 7 to get my new product." Is he correct? Explain your answer using numbers, pictures, or words.
Yes.
5 x 7 = 35
35 + 7 = 42
6 x 7 = 42
300
What number goes in the blank box of the top chart?
6
400
9 x ___=72
8
400
TRUE OR FALSE
6 X 4 = (5 X 4) + (1 X 4)
TRUE
400
If the medium pumpkin is 8 inches tall, how tall is the small pumpkin? Show your thinking.
About 4 inches because the small pumpkin looks like it's about half the size of the medium one.
4 x 2 = 8
400
When Rosemary got an array that was 5 rows of 2, she wrote the equation 5+2=10. Is this equation correct? Explain why in 1-2 sentences.
No, 5+2 would be seven. She needed a multiplication sign so her equation could say
5 x 2=10.
400
2 = 4
3 = 6
4 = ?
5 = 10
What number should go replace the question mark? Why?
8 because 4 x 2 = 8
500
8 x 2= ____x 4
4
500
Use a plus one/minus one fact to solve 9x4.
You should have two equations and work written down.
10 x 4 = 40
9 x 4 = 36
500
If pencil A is 6 inches long, how long is pencil C?
About 9 inches because pencil C looks like it is 1 and 1/2 times bigger than pencil A. That means it is the same size as pencil A PLUS 1/2 the length of pencil A.
6 + 3 = 9 inches
500
Miss Miller wanted to know how many window panes she had to wash in the room. She saw two sets of windows and each one has 6 panes. Her product was 12 window panes. Is this correct? Why or why not? Show your thinking with words, numbers, or pictures.
Yes, she is correct. 2 x 6 = 12.
500
1 = 6
2 = 12
3 = 18
4 = ?
What number should replace the question mark? Why?
24 because 4 x 6 =24