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 subtraction when bridging 10

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

Use efficient methods to solve subtraction equations

Solve problems involving addition and subtraction

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

In which of the following equations will you have to bridge 10?

Which of the following equations is correct?

Solve the following equation. 75 − 47 = {{ }}

64 tickets are needed to buy a cap and the unicorn. If the unicorn costs 36 tickets, how much does the cap cost? {{ }} tickets.

Izzy had 85 tickets and she bought a pair of sunglasses at the ticket shop. Now, she has 38 tickets left. How much did the sunglasses cost? {{ }} tickets.

Match each equation to the correct answer.

Which equation has a whole that is a multiple of 10?

Which bar model represents the equation shown? 61 = 93 − ?

Write the addition equation you would use to check this subtraction. 84 − 37 = 47

Which number would solve the equation. 54 − {{   }} = 31

Which bar model would represent the equation shown? {{   }} − 14 = 46

Solve problems involving subtraction when bridging 10

Lesson outcome