Multiply by 10 and 100
Break Apart to Multiply
Mental Math
Rounding and Reasonable
100
Find the product of 3x100
What is 300
100
Use break apart to solve: 4 x 36
What is 144
100
Use compensation to find the product 33 x 4
What is 132
100
Estimate the product of 3 x 86
What is 270
200
Mr. Jones does 100 sit ups every morning. How many situps will he do in 7 days?
What is 700 sit ups
200
Max is buying two chairs that cost $46 each. The tax on each chair is $5. What is the TOTAL COST?
What is $102
200
Use compensation to find the product of 9 x 83
What is 747
200
Estimate the product of 9 x 476
What is 4,500
300
Find each of the products below: 6X4= 6X40 = 6X400=
What is 24, 240, 2,400
300
Use break apart to solve: 5 X 127
What is 635
300
Anna's home is 394 miles from Columbus, Ohio. If Anna makes 5 one way trips from her home to Columbus, how many miles will she travel?
What is 1,970 miles
300
At a gym there are 11 people on a team. There are 8 teams. ABOUT how many people are on teams?
What is ABOUT 80
400
Last year, Adelphia collected 500 cans for a drive. This year they want to collect twice as many cans. How many cans does Adelphia hope to collect?
What is 1,000 cans
400
Which set of factors matches these partial products? 3 x50 = 150 3 x 7 = 21 A. 3 and 57 B. 3 and 75 C. 3 and 50 and 7 D. 3 and 171
What is A. 3 and 57
400
The florist is making centerpieces for some tables. She puts 16 roses into each of the 9 vases. How many roses did the florist use?
What is 144 roses
400
Mitch earned $88 delivering newspapers. He worked for 11 hours and earned $8 an hour. Is the amount Mitch earned reasonable? Explain.
What is Yes, the amount Mitch earned is reasonable because 8 x 10 = 80 and 80 is close to $88
500
Write your own multiplication problem with 5,600 as the product.
What is 80x70=5,600
500
Which is equal to 5 x25? A. (5x5) + (2x5) B. (5x20) + (5x1) C. 5x20 D. (5x20) + (5x5)
What is D. (5x20) + (5x5)
500
Mr. Cinelli drove 54 miles an hour for 3 hours. He used compensation to find out how far he drove. First, he multiplied 50 x 3 = 150. What should Mr. Cinelli do next?
What is 150 + 12 = 162
500
Joan needs 9 packs of envelopes and each pack costs $4. She decided that she will need to spend a total of $72 on envelopes. Is her decision reasonable? Explain.
What is No,because 4 x 10 = 40 and 40 is not close to 72.
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