Starter quiz
What is the missing part?- '10' ✓
What could the two missing parts be?- 1 and 7
- 1 and 6 ✓
- 2 and 5 ✓
- 3 and 3
- 4 and 3 ✓
-
- Which of these symbols means minus?
- +
- =
- − ✓
-
- Andeep has 5 biscuits and eats 3 of them. How many does he have left? Which equation represents this?
- 5 + 3 =
- 5 − 3 = ✓
- 3 − 5 =
-
- Izzy has 12 hair clips. 10 are pink and the rest are blue. How many are blue? ______ hair clips
- '2' ✓
- Sofia has 17 hair clips. She loses 7 of them. How many hair clips does she have now? ______ hair clips
- '10' ✓
Exit quiz
- Which of these part-part-whole models match the story? First Izzy had 19 strawberries and then she ate 5 of them. How many strawberries does she have left?
- Which equation below helps you to find the answer to 13 − 2 = ___?
- 13 − 3 = 10
- 3 − 2 = 1 ✓
- 13 + 2 = 15
-
- Complete the sentence: 7 minus 2 is equal to 5, so 17 minus 2 is equal to ______
- '15' ✓
- Complete the sentence: 6 minus 3 is equal to 3, so 16 minus 3 is equal to ______
- '13' ✓
- First, Izzy collected 18 stones. 5 stones are grey and the rest are brown. How many stones are brown? ______ stones
- '13' ✓
- First, Andeep had 15 stickers and then he gave Izzy 3 stickers. How many stickers does Andeep have now? ______ stickers
- '12' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- Subtraction facts within ten can be applied to subtraction within 20, e.g. if 5 - 2 = 3 then 15 - 2 = 13
- A number line can be used to show the link between subtraction of one-digit numbers and teen numbers.
Common misconception
Children may rely on counting strategies instead of using known facts to subtract from larger numbers.
Make comparisons between subtraction within 10 and within 20, looking for patterns. Make sure children notice that the ones digit stays the same when we subtract numbers with the same ones digits such as 5 - 2 and 15 - 2.
Keywords
Subtraction - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
Minus - A synonym for subtract, represented by the symbol -
Difference - The result of subtracting one number from another. How much one number differs from another.
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