Subtraction

• Mathematics
• Primary Education

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

In this lesson, you will, 

• Explore different ways to do subtraction
• Observe tutor demonstrations and follow on your own device
• Put the subtraction sums into real-life problems to understand when to subtract

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Question 1

561 - 459= 

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561-459

Adding on (using friendly numbers) with a number line

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561-459

Decomposing the number to make it easier

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561 - 459

Changing the number to easier numbers

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.

579-481

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

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Write a problem for this sum.
579-481.

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

300-35

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

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

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