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Column Addition Mastery

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Column Addition Mastery

Line up digits by place value and add from ones to hundreds. Regroup when a column totals 10 or more, then estimate to check that your answer is sensible.

Estimate and understand place value

1.Round 264 and 128 to the nearest ten. Which option is the best estimate for their sum?

2.Select every addition that needs regrouping from the ones column into the tens column.

36 + 48
53 + 24
72 + 19
41 + 37

3.When 53 + 176 are written in columns, which place-value column should the 3 in 53 line up with?

Hundreds
Tens
Ones

4.Round 638 and 247 to the nearest hundred. Choose the closest estimate for their sum.

700
800
900
1,000

Add using columns

Show your working by lining up the place values.

5.Calculate 38 + 57 using column addition.

6.Calculate 143 + 269 using column addition.

7.Calculate 406 + 87 using column addition. Pay attention to the zero in 406.

8.Charlotte has $124 saved and adds $79 from a birthday gift. How much money does Charlotte have altogether? Show the addition.

9.Challenge: Find the sum of 458 and 387 using column addition.

10.Choose one addition from this page. Explain how rounding helped you check whether your exact answer was reasonable. Include the words estimate, round, and place value.