Not wasting time or effort. An efficient strategy is one we can carry out easily.

Use number facts to solve addition and subtraction problems.

Maths

Add and subtract one to or from a two-digit number within a decade

Add and subtract 1 to and from a 2-digit number crossing the tens boundary

Use number facts to add or subtract a one-digit number and a two-digit number.

Use number facts to solve problems in measures and data contexts

Use number bonds to 10 to add/subtract one-digit and two-digit numbers

Add by bridging a multiple of ten

Subtract by bridging a multiple of ten

Use bridging to solve addition and subtraction problems

Find 10 more or less than a 2-digit number.

Add and subtract 10 to and from a 2-digit number.

Add multiples of 10 to 2-digit numbers.

Subtract multiples of ten from 2-digit numbers

Partition 2-digit numbers in different ways

Use efficient strategies to solve problems

In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction. In the future unit pupils will learn to find 10 more or less than a 2-digit number They will  add and subtract 10 to/from a 2-digit number using number facts

In the prior unit pupils added 3 addends. They used strategies such as finding 2 addends to total 10 or 2 numbers to bridge though 10. In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.

In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.

Adding and subtracting ones and tens to and from 2-digit numbers

Alex bought a cake for 34 p and a bag for 3 p. How much did he spend altogether? Which part-part-whole model represents the problem?

Sam spent 37 p altogether on a box and a ribbon. The ribbon cost 3 p. How much did the box cost?
Which known fact will help you solve the problem?

Choose the known fact that would help solve this problem. There were 54 cars in the car park. 3 were red. How many weren’t red?

Choose the known fact that would help solve this story. First, I had 75 books on the shelf. Then, 3 fell off. Now, how many books are on the shelf?

Sam’s sunflower was 86 cm tall and Alex’s sunflower was shorter. The difference between them was 4 cm. How tall was Sam’s sunflower. Write the known fact that would help you solve this problem.

Choose the known fact that would help solve this problem. Sam saved £45 and then she saved £4 more. How much money did she save altogether?

Which number would complete the equation that comes next in the pattern?

Use the first part-part-whole model to complete the pattern.

Use a known fact to find the missing number.  34 + {{ }} = 39

Match the correct single digit fact to the equation that it could help solve. 

Sam writes an addition that she can solve using the known fact 5 + 4 = 9      The first addend and the sum both have 6 tens. What could her fact be?

Use number facts to solve addition and subtraction problems.

Lesson outcome