The minuend is the number being subtracted from.

A subtrahend is a number subtracted from another.

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

When you adjust you make a change to a number. This is done to make a calculation easier to solve mentally.

Solve subtraction calculations mentally by using known facts

Maths

In this unit pupils will explain how increasing or decreasing the minuend affects the difference and solve subtraction calculations mentally using known facts explaining how adjusting the minuend can make mental calculation easier In the future unit pupils will explain how to balance equations with addition or subtraction expressions and use their knowledge of balancing equations to solve problems

In the prior unit pupils used the concept of same sum to simplify and solve addition problems  In this unit pupils will explain how increasing or decreasing the minuend affects the difference and solve subtraction calculations mentally by using known facts explaining how adjusting the minuend can make mental calculation easier

Use equivalence and compensation to simplify and solve subtraction problems

Use a known fact to find the missing number in this subtraction equation.
46 − 0.35 =  {{ }}

Use a mental strategy. {{ }} = 223 − 0.57

Use a mental strategy.
27.43 − 0.22 = {{ }}

Use a mental strategy.
{{ }} = 274.86 − 0.54

Use a mental strategy.
1,367,000 − 17,000 = {{ }}

Use a mental strategy. 9,284,000 − 22,000 = {{ }}

In the following equation, which number is the subtrahend?
21 − 4 =17

Solve the following calculation mentally by adjusting the minuend and subtrahend.
76 − 22 = {{ }}

Solve the following calculation using a mental strategy.
{{ }} = 150 − 68

Solve the following calculation mentally by adjusting the subtrahend and then the difference.
165 − 27 = {{ }}

Solve the following calculation using a mental strategy.
{{ }} = 4,050 − 98

Select the equivalent expressions (equal value) from the list below.

This lesson will soon be taken down.

Solve subtraction calculations mentally by using known facts

Lesson outcome