Multiply Mentally
Find the product mentally. 70 x 300 =
21,000
Estimate by rounding or using compatible numbers. 63 x 51 =
60 x 50 = 3,000
36 x 77 =
2,772
Write the prime factorization of 81 using exponents.
3 x 3 x 3 x 3 = 35
Felisa bought 26 boxes of crayons. Each box had 12 crayons. How many crayons did Felisa buy?
312 crayons
Find the product mentally. 21 x 100 =
2,100
Estimate by rounding or using compatible numbers. 7 x 89 =
7 x 90 = 630
124 x 9 =
1,116
Write the product of 5 x 5 x 5 x 5 x 5 using exponents.
55
Dana jogs 955 minutes a month. How many minutes will she jog in 4 months?
3, 820 minutes
Find the product mentally. 8 x 500 =
4,000
Estimate by rounding or using compatible numbers.9 x 31 =
10 x 30 = 300
315 x 40 =
12,600
Write the prime factorization of 27.
3 x 3 x 3 = 33
Derrick has 238 stamps in an album. How many stamps will he have in 4 albums?
952 stamps
Find the product mentally. 6 x 104 =
60,000
Estimate by rounding or using compatible numbers. 18 x 91 =
20 x 90 = 1,800
31 x 258 =
7,998
Each side of a cube-shaped box measures 6 feet. To find the volume, multiply the length times the width times the height. Express the amount of space inside as a power.
63
Mr. and Mrs. Hartford want to buy a car that costs $12,675. Mr. Hartford saved $235 each month for 8 months. Mrs. Hartford saved $375 each month for 9 months. If they combine their money, how much will they have? Will they have enough money to buy the car?
$5,225; They will not have enough money to buy the car.