To work out an answer, often by adding or subtracting.

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

Combine tens and ones within equations

Maths

Use efficient addition strategies to calculate

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

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

Use the Base 10 blocks shown to solve the equation.

Match the expressions which have the same value.

What is the missing whole in the bar model?

Match the equations to the correct missing addend.

Which of the digit cards shown would complete the equation?

Andeep wants to solve the equation 2 + 40 + 50 = ?     Which is the most efficient strategy to use?

Andeep estimates the cost of the items shown. Which of the following is most likely to be accurate?

For which of the following equations would you use the bridge 10 strategy?

For which equations would you use the known facts strategy? Tick two.

Andeep’s items cost £54     Which of the following will be the cost of Izzy’s items?

Match to show which equations will have the same sum. 

Combine tens and ones within equations

Lesson outcome