Starter quiz
If the subtrahend is 262, which part of the bar model below is the difference?- 367
- 105 ✓
- 262
-
- Solve the following calculation mentally by adjusting the minuend and subtrahend. 285 − 77 = ______
- '208' ✓
- Solve the following calculation mentally using unitisation. ______ = 3,900 − 1,300
- '2,600' ✓
- Solve the following calculation mentally by adjusting the minuend and then the difference. 4,008 − 1,300 = ______
- '2,708' ✓
- Solve the following calculation using a mental strategy. ______ = 703 − 146
- '557' ✓
Look at the jottings. What was the value of the adjustment to the subtrahend and the difference?- '24' ✓
Exit quiz
Jun and Laura are flipping coins and recording the results as they go. They each flip the coin 72 times. The table shows how many they each got except one blank cell. How many tails did Laura get?- '39' ✓
Jun and Laura are flipping coins and recording the results as they go. They each flip the coin 150 times. The table shows how many they each got except one blank cell. How many heads did Jun get?- '92' ✓
- Jun and Laura each take the same number of shots at the goal ring in netball. Jun scores 20 Laura scores 17 but misses 18 How many did Jun miss? ______ misses
- '15' ✓
- Jun and Laura each take the same number of shots at the goal ring in netball. Laura misses 32 and scores 21 Jun misses 16 only. How many did Jun score? Jun scored ______
- '37' ✓
Look at the pair of equations and use the complete one to help find the missing number in the second.- '2.36' ✓
Look at the pair of equations below and use the complete one to help find the missing number in the second.- '5,003' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- The more you subtract the smaller the difference.
- The less you subtract the greater the difference.
- A number line can be used to represent the change in the subtrahend.
Common misconception
Many pupils will try to adjust the difference in the same way that the subtrahend has been adjusted without considering the use of the inverse.
Start simply with double-sided counters to show the concept practically.
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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