Number and Operations in Base Ten: Multiplying One-Digit Numbers by Multiples of 10 (CCSS.3.NBT.2)

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Common Core 3rd Grade Math › Number and Operations in Base Ten: Multiplying One-Digit Numbers by Multiples of 10 (CCSS.3.NBT.2)

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What is 720 + 130?

850

CORRECT

840

800

1050

Add by place value: 700 + 100 = 800 and 20 + 30 = 50, so 800 + 50 = 850.

Which strategy works best to find 400 + 250?

Subtract 250 from 400, then add 250 back.

Stack the numbers but start adding from the hundreds only.

Round both to 500 and add to get 1000.

Use place value: add hundreds (400 + 200 = 600), then tens (+50) to make 650.

CORRECT

Breaking apart by place value is quick: 400 + 200 = 600, then add 50 to get 650.