Starter quiz
What is the missing whole in this bar model?- '100' ✓
- Complete the missing word minuend − subtrahend = __________
- difference ✓
- addend
- minuend
- sum
-
- Use a find the difference strategy to calculate: 72 − 65 = ______
- '7' ✓
What is the difference between the two values shown?- '70' ✓
- Use a partitioning strategy to calculate 690 − 270 = ______
- '420' ✓
- Which of the pairs of numbers have the smallest difference?
- 270 and 290 ✓
- 230 and 310
- 260 and 320
- 250 and 280
-
Exit quiz
What is the equation being shown here?- 60 = 780 − 720 ✓
- 60 = 780 + 720
- 60 + 780 = 720
- 780 − 720
-
Which strategy is being shown in this number line? Partitioning or counting on / back to find difference- Partitioning
- Counting on to find the difference
- Counting back to find the difference ✓
-
Use an efficient strategy to calculate the missing part in the bar model.- '16' ✓
- Use an efficient strategy to solve this problem: There are 330 children in the school. 270 of the children go on a school trip to the zoo. How many children do not go on the trip? ______ children
- '60' ✓
- Use an efficient strategy to solve this problem: Lucas has read 168 pages of his book. Alex has read 57 pages. How many more pages has Lucas read? ______ pages
- '111' ✓
- Use an efficient strategy to solve this problem: Alex and Jacob each collect football cards. Alex has 135 and Jacob has 82 cards. How many more cards does Alex have? ______ cards
- '53' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- By looking carefully at the minuend and subtrahend, we can choose the most efficient subtraction strategy.
- When numbers are close together, finding the difference is the most efficient strategy.
- Sometimes, we can use known addition facts to make finding the difference even more efficient.
Common misconception
Children will often reverse the minuend and subtrahend because they don't always appear in the order that they would in an expression.
Ensure that the children spend time understanding the context, either through discussion of the problem or through visual representations such as bar models. It's also worth spending time on vocabulary by playing fun word games or charades.
Keywords
Minuend - The minuend is the number being subtracted from.
Subtrahend - A subtrahend is a number subtracted from another.
Difference - The difference is the result after subtracting one number from another.
Partition - Partition is the act of splitting an object or value down into smaller parts.
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