7-1
10 x 12
120
Use mental math to solve 20 x 20
400
Round to estimate 31 x 12
30 x 10 = 300
Use compatible numbers to estimate 24 x 34
25 x 30 = 750
Keisha sold 8 ribbons and 6 pins at a craft fair. She sold the ribbons for $3 each and the pins for $2 each. How much money did Keisha earn?
$36
20 x 18
360
Use mental math to solve 50 x 10
500
Round to estimate 42 x 18
40 x 20 = 800
Use compatible numbers to estimate 78 x 24
80 x 25 = 2,000
Ken uses 6 apples and 2 bananas to make a fruit salad. He puts twice as many oranges as bananas in the salad. How many pieces of fruit will Ken use to make 2 fruit salads?
24 pieces of fruit salad
20 x 42
840
Use mental math to solve 50 x 40
2,000
Round to estimate 48 x 29
50 x 30 = 1,500
Use compatible numbers to estimate 42 x 26
40 x 25 = 1,000
Chad and Amy cut lawns in their neighborhood to make money. They charge $20 per lawn. One weekend, Amy cut 4 lawns and Chad cut 3 lawns. How much money did they earn all together?
$140
It takes about 40 gallons of water to do a load of wash. How many gallons of water does it take to do 15 loads of wash?
600 gallons of water
Fill in the blanks. To find 90 x 30, multiply ___ and ____ . The write ____ zeros at the end.
9, 3, 2
A deep-sea fisherman went fishing 14 times last month. He caught 28 fish each time. About how many fish did he catch all together last month?
10 x 30 = 300 fish
A total of 64 people can ride a Ferris wheel at one time. Using compatible numbers, estimate how many people can ride the Ferris wheel in 26 rides.
60 x 25 = 1,500
Colin put 3 rows of pictures on a bulletin board. He placed 6 pictures in each row. Jessie put 4 rows of pictures on a different bulletin board. She places 5 pictures in each row. How many more pictures did Jessie put on her bulletin board?
2 more pictures
Madge is making 20 bracelets to sell at the fair. She needs 17 beads for each bracelet. How many beads does she need in all?
340 beads
The owner of a party store ordered 30 boxes of American flags. There are 30 flags in each box. How many flags did the owner of the store order?
900 flags
There are 14 rows of windmills with 38 windmills in each row. Which shows the best way to estimate how many windmills there are all together?
10 x 40 = 400 windmills
Rita buys 22 cases of water for the school picnic. There are 24 bottles of water in a case. Using compatible numbers, write a number sentence that shows abut how many bottles of water Rita bought.
20 x 25 = 500 bottles of water
Mr. Tyler bought 2 sandwiches that cost $5 each. He also bought 3 salads that cost $4 each. He gave the clerk a $50 bill. How much change should he get back?
$28