Category 1
There are 12 girls on Sam's soccer team. Uniforms cost $33 each. Use estimation to write an equation.
10 x 30 = 300
Which expression is equal to 11 x 24?
a) (10 + 1) + (20 + 4)
b) (10 + 1) x (20 + 4)
c) (10 x 1) x (20 x 4)
d) (10 x 1) + (20 x 4)
b
The product of two factors is 1,200. One of the factors is 20. What is the other factor?
60
What is the product?
56 x 20
1,120
A store has 8 bins of notebooks. Each bin has 44 notebooks.
Nicholas broke 44 into 40 + 4 and wrote (8 x 40) + (8 x 4). Which property did he use?
Distributive property
Nika has a contract and needs to make 37 beaded necklaces. She puts 42 beads in each necklace. Which is the best way to use rounding to estimate the number of beads Nika needs?
40 x 40 = 1,600
Nika has about 1,600 beads.
The product of two factors is 8,000. One of the factors is 4,000. What is the other factor?
2
Remi's yard is 42 feet long and 8 feet wide. Her neighbor's yard is 36 feet long and 3 feet wide.
What is the area of Remi's yard?
42 x 8 =336 square feet
Graham swam 14 laps 12 times in May. He swam 15 laps 16 times in June.
How many laps did he swim in all?
14 x 12 = 168
15 x 16 = 240
168 + 240 = 408
Graham swam 408 laps in 2 months.
Which are equal to 420?
a) (40 x 1) + (2 x 10)
b) 30 x 10 x 4
c) 20 x 20 x 1
d) 21 x 20
e) 30 x 14
d & e
Which of the following could be used to help find the product of 23 x 40?
a) 23 + 40
b) 40 x 40 x 3 x 40
c) 40 + 40 + 3 + 20
d) 20 x 40 + 3 x 40
d
The lawn service charges $85 to mow, weed, and fertilize a lawn. How much did the lawn service earn if 15 lawns were tended in June and 23 lawns were tended in July?
15 + 23 = 38 lawns
38 x 85 = 3,230
The lawn service would earn $3,230.
A cook used 16 eggs in each omelet. What is the best way to use compatible numbers to estimate the number of eggs the cook uses for 22 omelets?
15 x 20
A bus is driving 18 miles every day. How many miles did they drive in 20 days?
18 x 20 = 360
They would drive 360 miles.
One mural is 27 feet long and 12 feet wide. Another mural is 18 feet long and 10 feet wide. What is the difference between the areas of the two murals?
27 x 12 = 324
18 x 10 = 180
324 - 180 = 144
The difference between the two murals is 144 square feet.