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# National Curriculum: Addition and Subtraction - Year 3 - Activities

Created on 14 October 2013 by ncetm_administrator
Updated on 10 March 2014 by ncetm_administrator

# Activities

Programme of Study statement Activity
A B C D E F G H
add and subtract numbers mentally, including:
• a three-digit number and onesâ€¨
• a three-digit number and tensâ€¨
• a three-digit number and hundreds

add and subtract numbers with up to three digits, using formal written methods of columnar addition and subtraction
estimate the answer to a calculation and use inverse operations to check answersy
solve problems, including missing number problems, using number facts, place value, and more complex addition and subtraction

## Activity A – Reach 100

The challenge is to find four different digits that give four two-digit numbers, which add to a total of 100. A good way to practise a particular method of written addition.

## Activity B – Consecutive numbers

An investigation looking at consecutive numbers, adding and subtracting them and looking for patterns. A great context for gaining a deeper understanding of our number system. It offers opportunities to work together by sharing results and making decisions.

## Activity C – Five Coins

An open-ended activity to practise addition and subtraction in the context of money.

## Activity D – Super Shapes

A good starter activity that provides an opportunity for pupils to practise using addition and subtraction, and it reinforces their inverse relationship. It also helps them become familiar with the idea of a symbol (in this case a shape) representing a number.

## Activity E – Triangular cards

An interactive resource, which is useful for demonstrating inverse operations. You can select different number bonds including decimals or input your own numbers. Useful for mental maths starters and plenaries. Children could also make their own cards and play hide and reveal as a group activity.

## Activity F – Addition of three digit numbers

A good visual aid to show regrouping.

## Activity G – The missing digit trick!

A great magical activity for rehearsing addition and subtraction.

## Activity H – Conductor counting

Split the whole class into three ability groups. Tell each group how they will be counting, i.e. one group could count in threes forwards, another group could count in threes backwards and another group could count in tens forwards etc. Teacher stands at the front of the class as the conductor and points to each group at different times.

This is a great way of differentiating whole class counting. It keeps the children on their toes, as they need to keep looking and listening, so that they know at which point they will need to be continue the count. You could stop at different intervals and ask what the calculation would be to get from one number to the next.

## Useful Resources

• digit cards
• digit fans
• number lines (blank, numbered, partly numbered)
• place-value cards
• base 10
• 100 squares
• money
• counters
• place-value counters
• whiteboards
• whiteboard pens