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

In this 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 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 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.

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. 

This lesson will soon be taken down.

Combine tens and ones within equations

Lesson outcome