3rd Grade Math- Computation & Estimation

A construction company painted an apartment complex brown and white using a total of 904 gallons of paint. They used 591 gallons of brown paint. The construction manager calculates that they used 413 gallons of white paint. Is the manager's calculation reasonable? Estimate the number of gallons of white paint by rounding the numbers to check the manager's calculation.

• The manager's calculation is reasonable because my estimate of 300 is fairly close to 413.

• The manager's calculation is reasonable because my estimate of 400 is fairly close to 413.

• The manager's calculation is not reasonable because my estimate of 300 is not close to 413.

• The manager's calculation is not reasonable because my estimate of 400 is not close to 413.

Harper Hospital treated 423 patients last week who were children, out of a total of 931 patients. The administrator calculates that they had 408 adult patients. Is the administrator's calculation reasonable? Estimate the number of adult patients by rounding the numbers to check the administrator's calculation.

• The administrator's calculation is reasonable because my estimate of 500 is fairly close to 408.

• The administrator's calculation is reasonable because my estimate of 400 is fairly close to 408.

• The administrator's calculation is not reasonable because my estimate of 500 is not close to 408.

• The administrator's calculation is not reasonable because my estimate of 400 is not close to 408.

Andrew has 72 trading cards and Ben has 36. Estimate how many they have in all.

• 100

• 110

• 120

• 130

What is the difference between Tina's number and Cory's number?

• 82

• 730

• 830

• 7,610

Subtract: 902 – 699

• 203

• 293

• 303

• 397

Add: 189 + 613

• 792

• 802

• 892

• 7,102

The total weight of two garden statues was 714 pounds. If one statue weighed 342 pounds, how heavy was the other one?

• 332 pounds

• 372 pounds

• 432 pounds

• 472 pounds

A grocery store placed 600 bags of sugar on the shelf in the baking aisle. The store sold 345 bags. How many bags does the store have left?

• 245 bags

• 255 bags

• 345 bags

• 945 bags

Jody adds 8 shells to her collection on each day of her vacation. She's on vacation for 4 days. How many shells does she add to her collection?

• 2 shells

• 24 shells

• 30 shells

• 32 shells

Sweet Tooth candy store got a shipment of 54 lollipops. They sorted them by flavor into equal groups with no lollipops left over. Which statement could be true of the groups of lollipops?

• There are 8 groups of lollipops with 8 lollipops in each group.

• There are 9 groups of lollipops with 6 lollipops in each group.

• There are 7 groups of lollipops with 8 lollipops in each group.

• There are 7 groups of lollipops with 9 lollipops in each group.