Year 5

# Rounding to estimate

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## Lesson details

### Key learning points

- In this lesson, we will apply our understanding of rounding to the nearest multiples of 10 000 and 1000 to estimate the answer to addition equations.

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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.

Which equation demonstrates how the number 346 000 can be partitioned?

30 000 + 4000 + 600

300 + 40 + 6

3000 + 400 + 60

Q2.

2. Use partitioning to solve the equation: 723 000 + 15 000 =

728 000

748 000

758 000

Q3.

3. Use partitioning to solve the equation: 456 000 - 132 000 =

234 000

235 000

325 000

Q4.

4. Use partitioning to solve the equation: 158 000 + 26 000 =

164 000

174 000

178 000

Q5.

5. Use partitioning to solve the equation: 738 000 - 156 000 =

482 000

682 000

782 000

### 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.