Starter quiz
Which value in this bar model is the minuend?- 78 ✓
- 54
- 14
-
- Solve the following calculation mentally by adjusting the minuend and subtrahend. 251− 36 = ______
- '215' ✓
- Solve the following calculation mentally using unitisation. ______ = 620 − 350
- '270' ✓
- Solve the following calculation mentally by adjusting the minuend and then the difference. 1,004 − 800 = ______
- '204' ✓
- Solve the following calculation using a mental strategy. ______ = 202 − 47
- '155' ✓
- Find the missing number in the equation below by adjusting the minuend. ______ = 749,000 − 21,000
- '728,000' ✓
Exit quiz
- Which word completes the following sentence? The more we __________, the less we are left with.
- add
- subtract ✓
-
- Which word completes the following sentence? The __________ the subtrahend, the smaller the difference.
- greater ✓
- smaller
-
- Without calculating the value of each expression can you work out which symbol should go between these two expressions? 54 − 23 ___ 54 − 13
- < ✓
- >
- =
-
- Without calculating the value of each expression can you work out which symbol should go between these two expressions? 987 − 156 ______ 987 − 256
- '>' ✓
- Without calculating the value of each expression can you work out which symbol should go between these two expressions? 578,234 − 512,293 ______ 578,234 − 502,293
- '<' ✓
- Without calculating the value of each expression can you work out which symbol should go between these two expressions? 9.2 − 1.3 ______ 9.2 − 1.03
- '<' ✓
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
Pupils might think that if the subtrahend increases or decreases then so too does the difference. They might find it initially difficult to understand the idea of the inverse in the context.
Give lots of practical examples of this such as emptying out bottles or eating sweets demonstrating an increase in the subtrahend and its effect on the difference.
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.
Adjust - When you adjust you make a change to a number. This is done to make a calculation easier to solve mentally.
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