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.

Choose the most efficient strategy to subtract from a 3-digit number

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

Which strategy is being shown in this number line? Partitioning or counting on / back to find difference

Use an efficient strategy to calculate the missing part in the bar model.

Use an efficient strategy to solve this problem: There are 330 children in the school. 270 of the children go on a school trip to the zoo.
How many children do not go on the trip? {{ }} children

Use an efficient strategy to solve this problem: Lucas has read 168 pages of his book. Alex has read 57 pages. How many more pages has Lucas read? {{ }} pages

Use an efficient strategy to solve this problem: Alex and Jacob each collect football cards. Alex has 135 and Jacob has 82 cards. How many more cards does Alex have? {{ }} cards

What is the missing whole in this bar model?

Complete the missing word minuend − subtrahend = __________

Use a find the difference strategy to calculate: 72 − 65 = {{ }}

What is the difference between the two values shown?

Use a partitioning strategy to calculate 690 − 270 = {{ }}

Which of the pairs of numbers have the smallest difference?

This lesson will soon be taken down.

Choose the most efficient strategy to subtract from a 3-digit number

Lesson outcome