New
New
Year 6

Solve addition calculations mentally by using known facts in a range of contexts

I can solve addition calculations mentally by using known facts in a range of contexts.

New
New
Year 6

Solve addition calculations mentally by using known facts in a range of contexts

I can solve addition calculations mentally by using known facts in a range of contexts.

Lesson details

Key learning points

  1. If I increase this part by __ then the whole will increase by the same amount.
  2. If I decrease this part by __ then the whole will decrease by the same amount.
  3. A balance beam can represent unequal expressions or inequalities.

Common misconception

Pupils may be very quick to try and use a written method such as columns here, particularly as the numbers get larger.

Encourage the children to refrain and reward them taking risks and avoiding using written methods as much as possible. Prove to them that it's quicker to do it in your head or with jottings by racing your fastest 'columns ' exponent!

Keywords

  • Whole - The whole is all the parts or everything, the total amount.

  • Part - A part is a piece or section of the whole.

  • Adjustment - An adjustment is a change to a number using either subtraction or addition.

  • Capacity - Capacity is the amount that something can hold.

Because money is involved, it is worth practising some counting in tenths and hundredths followed by counting in pennies and ten-pennies.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
Tick the equivalent expressions
Correct answer: 30 + 16
Correct answer: 15 + 31
17 + 32
Correct answer: 29 + 17
14 + 30
Q2.
Tick the two numbers that are complements to 1,000
Correct answer: 369
285
723
534
Correct answer: 631
Q3.
Tick the two numbers that are decimal complements to 10
Correct answer: 3.53
2.85
Correct answer: 6.47
5.34
8.37
Q4.
What is the missing number in this equation? 89 + = 150
Correct Answer: 61
Q5.
What is the missing number in this equation? 15 + 25 + = 70
Correct Answer: 30
Q6.
What is the missing number in this equation? 55 + 12 + = 80 + 14
Correct Answer: 27

6 Questions

Q1.
Which of the following describes capacity?
Correct answer: Capacity is the amount that something can hold.
Capacity is the space inside an object.
Capacity is the willingness to do something.
Capacity is the sum of all the parts.
Q2.
Without using a written method, calculate the cost of a slice of cake and a cupcake based on the prices shown. Total cost is £
An image in a quiz
Correct Answer: 4, £4
Q3.
Without using a written method, calculate the cost of a full cake and a slice based on the prices shown. Remember to use the correct notation for money.
An image in a quiz
Correct Answer: £12.90, 1290 p, 12.90
Q4.
Without using a written method, calculate the cost of a full cake and a cupcake based on the prices shown. Remember to use the correct notation for money.
An image in a quiz
Correct Answer: £10, £10.00, 10
Q5.
What’s the missing total in the table? Use the first row to help. Remember to use correct notation for money.
An image in a quiz
Correct Answer: £62.40, 62.40
Q6.
A popstar has a concert. What was the combined attendance for Paris and Berlin? Use the information in the table.
An image in a quiz
Correct Answer: 85,156, 85 156