Starter quiz
If the difference is 19, which part of the bar model below is the subtrahend?- 112
- 93 ✓
- 19
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- Solve the following calculation mentally by adjusting the minuend and subtrahend. 456 − 42 = ______
- '414' ✓
- Solve the following calculation mentally using unitisation. ______ = 890 − 540
- '350' ✓
- Solve the following calculation mentally by adjusting the minuend and then the difference. 3,005 − 1,200 = ______
- '1,805' ✓
- Solve the following calculation using a mental strategy. ______ = 903 − 46
- '857' ✓
- Without calculating the value of each expression can you work out which symbol should go between these two expressions? 8.04 − 2.3 ______ 8.04 − 3.2
- '>' ✓
Exit quiz
Look at the image of the counters. What is being referred to by the question mark?- Subtrahend
- Minuend ✓
- Difference
-
- True or false? If the minuend stays the same and the subtrahend decreases then the minuend and subtrahend will be further apart on a number line.
- True ✓
- False
Look at the jottings. Which word would you use to complete the following sentence? I’ve kept the minuend the same and subtracted 15 from the subtrahend so I had to ______ 15 to the difference- 'add' ✓
Look at the jottings. Which same number works in both gaps in this sentence? I’ve kept the minuend the same and added ______ to the subtrahend so I had to subtract ___ from the difference.- '18' ✓
Look at the jottings. What was the value of the adjustment to the subtrahend and the difference?- '108' ✓
Which number in the final equation shown is incorrect?- 734
- 262
- 537 ✓
-
Worksheet
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Presentation
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Lesson Details
Key learning points
- The more you subtract the less you are left with.
- The less you subtract the more you are left with.
- A number line can be used to represent the change in the subtrahend.
Common misconception
The proportionality of bar models is something that children sometimes find tricky and causes them concern.
Remind them that accuracy is not completely necessary so long as they have roughly sized the parts (subtrahend and difference in these contexts). Alternatively, give them number rods to arrange as bar models and then draw around.
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.
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