Which Operation?

Single Step 1

100

A company offers river rafting trips for 21 weeks during the warm months of the year. There are enough rafts to allow 48 people a week to go on rafting trips, and the rafts are always filled. What is the BEST estimate of the total number of people that the company takes on rafting trips during the year?

Round then multiply

Round 21 and 48, then 20 x 50

200

It rained 0.9 inches on Monday. On Tuesday, it rained 0.7 inches less than on Monday. How much did it rain on Tuesday?

Subtract

0.9 - 0.7

300

Karen bought 1.3 pounds of potatoes and 2.8 pounds of carrots. About how many pounds of vegetables did she buy in all?

Add

1.3 + 2.8

400

Kenji and his classmates placed colored blocks on a scale during a science lab. The red block weighed 2.75 pounds and the purple block weighed 1.03 pounds. About how much more did the red block weigh than the purple block, rounded to the nearest tenth?

Round then subtract

Round 2.75 and 1.03, then 3 - 1

500

Robbie weighed two colored metal balls during a science class. The brown ball weighed 8.91 pounds and the blue ball weighed 2.53 pounds. If Robbie places both balls on the scale at the same time, what will the scale read?

Add

8.91 + 2.53

Single Step 2

100

Abe mixed 0.44 grams of salt into a pot of soup he was cooking. Before he served the soup, Abe added 0.55 grams of salt. How much salt did Abe put into the soup in all?

Add

0.44 + 0.55

200

Warren's dog eats 0.5 kilograms of dog food each day. How much dog food will Warren's dog eat in 8 days?

Multiply

0.5 x 8

300

Simon placed 13 weights on a scale during science class. If each weight weighed 2.3 grams, what did the scale read?

Multiply

13 x 2.3

400

Shane bought a package of 7 chocolate cookies. Each cookie weighed 0.8 ounces. About how much did the 7 cookies weigh all together?

Multiply

7 x 0.8

500

In March it rained 4.45 inches. It rained 1.59 inches less in April than in March. How much did it rain in April?

Subtract

4.45 - 1.59

Single Step 3

100

Damon is jogging 4.4 miles per hour. Eric runs 3 times as fast. How fast does Eric run?

Multiply

4.4 x 3

200

A land developer is splitting up 616.5 acres of land to form 5 identical properties. What size will each property be?

Divide

616.5 divided by 5

300

A factory makes 4.2 gallons of lemonade per minute. How many gallons of lemonade will the factory make in 14 minutes?

Multiply

4.2 x 14

400

A pasta factory made 292.8 pounds of pasta in 5 minutes. How much pasta did the factory make each minute?

Divide

292.8 divided by 5

500

Wesley used 1.6 kilograms of almonds to make 8 batches of snack mix. About how many kilograms of almonds were in each batch?

Divide

1.6 divided by 8

Multi-Step 1

100

The Pinnacle Tower Complex has 3 buildings. Each building has 27 floors. There are 45 offices on each floor. How many offices are in the Pinnacle Tower Complex altogether?

Multiply twice

3 x 27 x 45

200

Jackie earns $6.75 per hour babysitting. She works 5 hours on Friday, and 4 hours on Saturday. What are her total earnings for those two days?

Add the hours, then multiply

(5 + 4) x $6.75

300

Peter ran 3.4 miles on Monday, 2.1 miles on Tuesday, 6 miles on Wednesday and ½ mile on Thursday. How far did Peter run on these four days?

Add all the numbers

3.4 + 2.1 + 6 + 0.5

400

Wilson saved up $34.21. Then he got $20 for his allowance. Wilson spent $5.41 on a pair of gloves, $7.27 on a winter hat, and $22.44 on a scarf. How much money does Wilson have left?

add once, subtract 3 times

$34.21 + $20 - $5.41 - $7.27 - $22.44

500

Mr. Rye has 765 roses and 288 daisies to put in 27 vases. He wants to put the same number of roses in each vase and the same number of daisies in each vase. How many flowers will be in each vase?

Add, then divide

(765 + 288) divided by 27