Taxi Passenger: How much I owe you?
Taxi Driver: That will be £7 please.
Ten.
There you go, £3 change.
Thank you.
Taxi Passenger: Thank you very much.
Taxi Driver: I use subtraction, when I'm giving customers change, because it's important to get it right, and so the customer don't feel as if I'm ripping them off.
Male sitting at a desk, wearing glasses and red tie: I would do subtraction when somebody phones up; I'll take a note of what time they phoned up.
And then I would carry on working on their case, and when they finish, and make a note of what time that I finished working on the job.
Female with long black hair, wearing black top: Subtractions help me to reorder the stock.
I'm meant to have 30 bowls of these.
I have ten now.
That means I need to reorder 20 bowls more.
Subtraction is when you take one amount from another. It is the opposite of addition.
Quick tips for tutors
Subtraction includes:
- Subtracting three-digit numbers
- Recalling Subtraction facts to 20
- Subtracting using efficient mental methods
- Subtracting using rounding
Downloadable Factsheets
Entry 3 - Counting on using an empty number line
How to subtract numbers using an empty number line to count on from one number to a higher number.
Entry 3 - Help with subtraction: Remainders
How to do mental subtraction with the help of place value and subtraction as the reverse of addition.
Entry 3 - Subtraction methods
Summary of some key methods that help with subtraction.
Entry 3 - Subtracting by splitting up numbers
How to make subtraction easier by breaking numbers up into smaller parts.
Entry 3 - Mental subtraction key words
Summary of the main words and terms used in subtraction exercises.
Level 1 - Rounding subtraction 1
How to estimate numbers for quick mental subtraction.
Level 1 - Rounding subtraction 2
Summary of methods to find approximate answers in mental subtraction, with examples.
Level 1 - Subtraction glossary
Summary of key words and terms used in subtraction exercises, with examples.
Downloadable Worksheets
Entry 1 & 2 - Back to square one
Subtraction snakes and ladders game.
Entry 1 & 2 - Booking a holiday
An activity in using subtraction to book a holiday.
Entry 3 - Using empty number lines
Exercise in using blank number lines to calculate missing numbers.
Entry 3 - Identifying subtraction methods
Exercise in pairing the appropriate subtraction methods with subtraction calculations.
Entry 3 - Splitting up numbers
Exercise in breaking up numbers into smaller parts as an aid to subtraction.
Entry 3 - Identifying the correct subtraction
Exercise in spotting correct and incorrect subtractions.
