Mental Math
Two-Digit by One-Digit Multiplication
Three-Digit by One-Digit Multiplication
Use Rounding to Estimate
Problem Solving
100
50 x 3=
What is 150?
100
31 x 3=
What is 91?
100
321 x 2=
What is 642?
100
108 x 6 List the number(s) you rounded to!
100 x 6 What is 600?
100
An orchard has 48 apple trees. It has 3 times as many cherry trees. How mahy cherry trees does the orchard have?
What is 144 cherry trees at the orchard?
200
700 x 2=
What is 1400?
200
72 x 3=
What is 216?
200
530 x 0=
What is 0?
200
476 x 9
500 x 9 What is 4,500?
200
An office ordered six copy machines. The machines each weigh 108 pounds. How much do they weigh all together?
What is 648 lbs all together?
300
60 x 5
What is 300?
300
82 x 5
What is 410?
300
265 x 4=
What is 1,060?
300
82 x 3
80 x 3 What is 240?
300
Alaina decided to make some money by mowing lawns. She charges 30 dollars per large lawn, and 20 dollars per small lawn. If she has 5 large lawns and 2 small lawns, how much does she make each weekend? Show your work for the problem
What is 190? Large 30 x 5= 150 and small 20 x 2=40 150 + 40= 190 dollars each weekend
400
4,000 x 7=
What is 28,000?
400
69 x 8=
What is 552?
400
506 x 4=
What is 2,024?
400
77 x 7
80 x 7 What is 560?
400
There are 24 hours in a day. We go to school for about 7 hours each day. How long do we go to school in a five-day week?
What is 35 hours each week?
500
8,000 x 900=
What is 7,200,000?
500
99 x 9=
What is 891
500
159 x 5=
What is 795?
500
249 x 4
250 x 4 What is 1,000?
500
Three friends sell their old playstation and xbox games. They decided to pool their games together and split it evenly. If they made 210 dollars total, how much does each friend get?
What is 70 dollars each?
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