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## Lesson details

### Key learning points

- In this lesson, we will learn how to use the column method in order to solve addition equations.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 5 Questions

Q1.

What does 'rounding to estimate' mean?

Adding and subtracting using the column method.

Using decimal numbers in addition equations.

Using whole numbers in addition equations.

Q2.

Round '456 244' to the nearest multiple of 10 000.

400 000

450 000

500 000

Q3.

3. Using rounding to the nearest multiple of 10 000 to estimate the answer to: 341 782 + 456 913 =

300 000 + 500 000 = 800 000

340 000 + 450 000 = 790 000

342 000 + 457 000 = 799 000

Q4.

4. Use rounding to the nearest multiple of 1000 to estimate the answer to: 187 221 + 243 891 =

187 000 + 243 000 = 430 000

190 000 + 240 000 = 430 000

200 000 + 200 000 = 400 000

Q5.

What is one of the problems associated with rounding to estimate?

Rounding to estimate always takes much longer than actually calculating the answer.

Rounding to estimate does not allow you to subtract.

Rounding to estimate makes equations harder to calculate.

### 5 Questions

Q1.

Why might it be useful to estimate the answer to an equation prior to calculation?

Estimating before calculating helps you set out your calculations on paper.

Estimating before calculating helps you to practise your adding strategies.

Estimating before calculating shortens the amount of time it takes to solve an equation.

Q2.

2. What is a suitable estimate for the equation: 451 082 + 339 721?

451 082 + 339 721 = 790 803

451 083 + 339 722 = 790 805

500 000 + 200 000 = 700 000

Q3.

3. Use the column method to solve: 289 109 + 463 229 =

452 338

552 338

652 338

Q4.

4. Use the column method to solve: 632 781 + 10 385 =

743 166

843 166

943 166

Q5.

5. Use the column method to solve: 5411 + 1389 + 2013 =

7813

8913

9813