# Subtraction

Subtraction without a calculator
• To calculate profit (total sales minus expenses)
• To calculate net pay (gross pay minus deductions
• To work out reductions/discounts
• How much off/how many left
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Slide 1: Tekstslide
MathematicsPrimary Education

In deze les zitten 22 slides, met interactieve quizzen en tekstslides.

## Onderdelen in deze les

Subtraction without a calculator
• To calculate profit (total sales minus expenses)
• To calculate net pay (gross pay minus deductions
• To work out reductions/discounts
• How much off/how many left

#### Slide 1 -Tekstslide

In this lesson, you will,
• Explore different ways to do subtraction
• Put the subtraction sums into real-life problems to understand when to subtract

Question 1
561 - 459=

#### Slide 7 -Tekstslide

561-459
Adding on (using friendly numbers) with a number line

#### Slide 9 -Tekstslide

561-459
Decomposing the number to make it easier

#### Slide 11 -Tekstslide

561 - 459
Changing the number to easier numbers

#### Slide 13 -Tekstslide

You have £561 in your account on Monday. You have £459 left in your account on Friday. How much did you spend during the week? Write your own problem for 561-459. Use the language cards to help you.

#### Slide 14 -Open vraag

579-481
Your total earnings (gross pay) for a day were £579. Your net pay was £481. By how much were you deducted?

#### Slide 15 -Tekstslide

Write a problem for this sum.
579-481.

#### Slide 17 -Open vraag

What way would you do this sum: 579-481? Which method seems easier?

#### Slide 18 -Open vraag

300-35
Your gross pay was £300. You were deducted £35. What was your net pay?

#### Slide 19 -Tekstslide

Make up a problem for this sum:
300 - 35 =

#### Slide 21 -Open vraag

On the whiteboards/number lines calculate 300-35. Upload a picture of your work here.