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.

Solve problems involving addition and subtraction

Maths

Use efficient addition strategies to calculate

Combine tens and ones within equations

Add two-digit numbers without crossing the tens boundary

Find the missing addend when adding two-digit numbers

Add 2-digit numbers when crossing the tens boundary

Solve problems involving the addition of two-digit numbers

Explain different strategies used to subtract

Solve equations involving the subtraction of two-digit numbers

Solve problems involving subtraction of two-digit numbers

Subtract two-digit numbers crossing the tens boundary

Find the missing part when subtracting two-digit numbers

Solve problems involving subtraction when bridging 10

Use efficient methods to solve subtraction equations

Create addition and subtraction problems

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.

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.

Addition and subtraction of two 2-digit numbers

89 points are needed to buy these trainers and the t-shirt. How many points do the trainers cost? Which equation would solve this problem?

What is the total cost of the hat and the glasses?

Match the equations that will have the same total.

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

First, Andeep had 86 points. Then, he bought a hat. Then, he bought a pair of glasses. How many points did he have left? 86 − 30 − 32 = ? Andeep had {{ }} points left.

Choose an equation to represent the problem. Then, solve it. First, Izzy had 78 points. Then, she bought a t-shirt. Then, she bought a pair of shoes. How many points does she have left?

Write a subtraction equation that could be represented by this bar model and solve it.

Which of the following equations will have a difference of 1?

One of the missing numbers in this equation is 93 Which of the following could be the other missing number? ___ − ___ = 1

In which of the following equations will the missing part be a multiple of 10?

What is the missing digit in the equation?

Solve problems involving addition and subtraction

Lesson outcome