The minuend is the number being subtracted from.

A subtrahend is a number subtracted from another.

The difference is the result after subtracting one number from another.

Partition is the act of splitting an object or value down into smaller parts.

Use addition and subtraction to solve problems in different contexts

Maths

In this unit pupils will add and subtract two 3-digit numbers using partitioning, adjusting, redistribution and bridging. In the future unit pupils will accurately and efficiently solve multi-step addition and subtraction problems. They will understand and explain how both addition and subtraction equations can be used to describe the same additive relationship.

In the prior unit pupils found pairs of number that composed 100 and positioned 3-digit numbers on a number line and estimated their position on unmarked number lines. They compared and ordered 3 digit numbers. In this unit pupils will add and subtract two 3-digit numbers using partitioning, adjusting, redistribution and bridging

Informal and mental strategies for adding and subtracting two 3-digit numbers

Choose the correct equation for this word problem: Laura has baked 15 cupcakes. She gives 7 of them to her friends. How many does she have left?

Use an efficient strategy to solve this problem: In one year, the local council plants 420 trees. The next year, they plant 190 more. How many trees have been planted over the two years? {{ }} trees

Use an efficient strategy to solve this problem: In a science experiment, Aisha makes 440 g of slime. Laura makes 270 g of slime. They mix their slime together. How much slime is there now? {{ }} g

Use an efficient strategy to solve this problem: Aisha pours herself 330 ml of squash. Laura kindly pours in 95 ml more before Aisha drinks 58 ml. How much squash does she have left? {{ }} ml

What is the top value of the top brick in this addition pyramid?

Find the missing number in the magic addition square. All the rows, columns and diagonals add up to 300

Complete the missing word _______ − subtrahend = difference

What is the missing part in this bar model?

Which of the pairs of numbers have a difference of 60?

Which of these is the correct equation represented by this number line?

Look at the number line. Which number is missing from the equation? 670 − 150 = {{ }}

Look at the number line. Which number is missing from the equation? 220 + {{ }} = 480

This lesson will soon be taken down.

Use addition and subtraction to solve problems in different contexts

Lesson outcome