Websink Prep UKKS2 Arithmetic (SATs)Year 6 chaptersArithmetic (SATs) textbooksYear 6Browse allPast papersFind a tutorBecome a tutor
SATs practice · Year 6Chapter 7 · Mental arithmetic
Year 6 Arithmetic (SATs) · Mental arithmetic · Lesson 7.5

Year 6 Arithmetic (SATs): Timed set: mixed mental questions

Part of the Year 6 Arithmetic (SATs) mental arithmetic chapter. Chapter overview · whole chapter on one page

7.5

Timed set: mixed mental questions

Year 6
Perform mental calculations, including with mixed operations and large numbers (Year 6), Use estimation to check mental answers (Year 5-6)
Story. This is a mixed set of 20 questions. Work out each one in your head. The practice guide suggests about 10 minutes for the set.

Rule

Timings in this book are a practice guide only. They are not a rule of the official test. Work steadily: check each answer with a quick estimate, then move on.

Key ideas

  • Work out each question in your head before writing the answer.
  • Estimate first to see whether the answer is sensible.
  • If you are stuck, split the numbers and try again.
Worked example 7.5.1
Work out 8 × 7 + 9 in your head.

Method. Multiply first, then add.

  1. Multiply. 8 × 7 = 56.
    56
  2. Add. 56 + 9 = 65.
    65
  3. Write the answer.
    65

Check. About 8 × 7 = 56, plus 9 is about 65. ✓

Worked example 7.5.2
Work out 25 × 4 in your head.

Method. Think of 25 as a quarter of 100.

  1. Use the fact. 25 is one quarter of 100, so 25 × 4 is 100.
    25 × 4
  2. Check. Four lots of 25 make 100.
    25 + 25 + 25 + 25 = 100
  3. Write the answer.
    100

Check. 100 ÷ 4 = 25. ✓

Worked example 7.5.3
Work out 6.4 - 2.9 in your head.

Method. Subtract 3 and then add back the 0.1 taken too much.

  1. Subtract 3. 6.4 - 3 = 3.4.
    3.4
  2. Add 0.1. 2.9 is 0.1 more than 3, so add 0.1 back.
    3.5
  3. Write the answer.
    3.5

Check. 3.5 + 2.9 = 6.4. ✓

Exercise 7E  Timed set: 20 mental questions

Non-calculator
1
FWork out 4,800 + 3,700.
2
FWork out 15 × 6.
3
FWork out 2,000 - 1,250.
4
FWork out 9 × 12.
5
FWork out 0.4 + 0.9.
6
FWork out 64 ÷ 8.
7
FWork out 3.2 × 10.
8
FWork out 1/2 of 90.
9
FWork out 700 × 6.
10
FWork out 5,600 ÷ 100.
11
FWork out 99 + 99.
12
FWork out 1,000 - 634.
13
FWork out 7 × 11.
14
FWork out 12.5 × 2.
15
FWork out 2/3 of 15.
16
FWork out 3.6 - 1.4.
17
FWork out 250 × 4.
18
FWork out 6 × 6 + 4.
19
FWork out 3,000 + 2,500 - 1,000.
20
FWork out 10 × 10 ÷ 4.

Websink Prep UK is an independent site. It is not affiliated with, endorsed by or sponsored by AQA, Pearson Edexcel, OCR, WJEC, Eduqas, CCEA, SQA, GL Assessment, CEM or the Department for Education. All exam board names and trademarks belong to their owners. Past papers are linked from the exam boards' own websites and are not hosted here.

About Websink Prep UK · Find a tutor · Privacy · Terms · Cookie settings