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LESSON 10 Multiplication Strategies
Solve the following problems:
- Decide whether you need an exact answer or an estimate.
- Then, decide whether it is more efficient to use mental math or paper-and-pencil. See the Multiplication Strategies Menu in the Student Activity Book.
Show all your work with paper and pencil. Be prepared to explain your mental math strategies.
- A sailboat can travel about 27 miles in 1 hour. How far can the sailboat travel in 6 hours?
- There are 25 crackers in a box. If 5 children each ate one box of crackers, how many crackers did the children eat altogether?
- Mr. Thomas drove for 3 hours without stopping. He drove about 55 miles every hour. About how far did he drive?
- The Rodriguez family is having a big party. Mrs. Rodriguez knows she should have 70 cans of soda. Ana buys 3 cases of soda. Each case contains 24 cans of soda. Will this be enough soda? Why or why not?
- There are about 22 students in each classroom at Smith School. There are 8 classrooms in the school. About how many students are in the school?
- The array below has 6 rows of 13 tiles. How many tiles are in the array?
- Maya's array has 7 rows of 50 tiles. Ming's array has 7 rows of 46 tiles. Whose array has more tiles? How do you know?
