Topic 8 Assessment

Write the number that make this equation true:

(2+1)+3=2+(__+3)

A mother elephant at the zoo ate 171 pounds of food one day. A baby elephant ate 79 pounds of food that day. Choose all the equations that show a reasonable estimate for how much they ate all together.

• 175+80=255

• 100+70= 170

• 170+80=250

• 175+85=250

• 130+80=200

Round to the nearest 10 to estimate the difference of 689-271.

Choose all the equations that are true

• 0+531=0

• 160+256=256+160

• (130+65)+340=130+(65+340)

• (123+57)+180=153+(87+180)

• 843+0=843

Round 467 to the nearest 10

Sally find 217-62=155. Choose the option Sally can check her work using the inverse operation.

• Add 62 and 217

• Add 155 and 217

• Add 62 and 155

• Subtract 62 from 155

Jake wants to round to the nearest hundred to estimate the sum of 371 and 482. He wrote 370+480=850.

What mistake did Jake make?

• Jake should have rounded 371 to 350 and rounded 482 to 450

• Jake should have rounded 371 to 350 and 482 to 500

• Jake should have rounded 371 to 400 and 482 to 400

• Jake should have rounded 371 to 400 and 482 to 500

What is the sum of 271 and 582 rounded to the nearest 100

• 300

• 900

• 850

• 1,000

Larry subtracts 356 from 873 and gets 517. What addition equation can he use to check his answer?

256+___=873

Round 753 to the nearest 100