Addition involves finding the total, or sum, by combining two or more numbers.

Subtraction involves taking one number away from another.

An addition or subtraction strategy where numbers are partitioned to reach the previous or next multiple of 10, so bonds to 10 can be used to calculate more efficiently.

Create addition and subtraction problems

Maths

In this unit pupils apply their knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers both within and across the tens boundary. In the future unit pupils will add 3 addends, understanding they can be added in any order, bridging through 10.

In the prior unit pupils added and subtracted 1s and 10s from 2 digit numbers. They used number facts to add/subtract a single-digit number to/from a 2-digit number and used a part-part-whole model to represent addition and subtraction. In this unit pupils apply knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers within and across the tens boundary.

Addition and subtraction of two 2-digit numbers

Addition, increasing one part by the other part to make the whole.

Addition, combining the parts to make the whole.

Subtraction, decreasing the whole by one part to reach the remaining part.

Subtraction, partitioning one part from the whole to find the remaining part.

Which of the following describes the type of problem shown?
There are 45 apples on one tree and 34 apples on another tree. How many apples are there altogether?

Subtraction, partitioning one part from the whole to find the remaining part. 

Which of the following describes the type of problem shown? There are 45 apples on the tree and 26 fall off. How many apples are left on the tree?

Which equation would you use to solve this problem? There were 52 children on the school trip. 35 of them were in the museum and the rest were having lunch. How many were having lunch?

Which equations would you use to solve this problem? The children are going home from the school trip. 28 got on the first bus and 24 on the second bus. How many children got on the buses altogether?

Write an equation to solve this problem. On Monday, I picked 35 apples from a tree. Then, on Tuesday, I picked 27 more apples. How many apples have I picked now?

Write an equation to solve this problem. I picked 56 apples from a tree. 27 of them were green and the rest were red. How many apples were red?

First, Izzy had 76 points. Then, she bought this t-shirt. How many points will she have left now? Which equation would solve this problem?

First, Andeep bought a t-shirt. Then, he bought a pair of glasses. How many points has he spent?

Match the equations that will have the same value.

Which number line represents the same equation as the number line shown?

First, Izzy bought a t-shirt. Then, she bought a pair of shoes. Finally, she bought a pair of glasses. How many points does she spend altogether? 35 + 20 + 32 = ? Izzy spent {{ }} points.

Andeep had 98 points. He bought these items. How much did the glasses cost? 98 − 30 − 15 = {{ }} The glasses cost {{ }} points.

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