Starter quiz
- Complete the statement. The additive ______ of a number is a number that, when added to the original number, gives the sum of zero.
- 'inverse' ✓
- Match together each of these subtractions with its equivalent addition.
- 8 - 5⇔8 + (-5) ✓
- 5 - 8⇔5 + (-8) ✓
- 8 - (-5)⇔8 + 5 ✓
- (-5) - 8⇔(-5) + (-8) ✓
- Match each calculation to its answer.
- 8 - 5⇔3 ✓
- 5 - 8⇔(-3) ✓
- 8 - (-5)⇔13 ✓
- (-5) - 8⇔(-13) ✓
- Work out 12 - (-8)
- -20
- -4
- 4
- 20 ✓
-
- Select the calculations which are equivalent to 15 - 20
- 15 - 15 - 5 ✓
- 15 + (-15) + (-5) ✓
- 15 - (-15) - (-5)
- 15 + (-20) ✓
- 15 + (-15) - (-5)
-
- Lucas has a balance of £2.72 at the school canteen. He spends £5. What is Lucas' new balance?
- -£7.72
- -£2.28 ✓
- -£2.38
- £2.28
- £2.38
-
Exit quiz
- Select the best word to complete the statement. __________ units are based around the standard units of metre, gram and litre.
- Basic
- Decimal
- Imperial
- Measuring
- Metric ✓
-
- Mr Oak's bank account has a balance of £125. He spends £160. What is Mr Oak's new balance?
- £285
- £35
- £25
- -£25
- -£35 ✓
-
- The balance on a bank account is £1475. What is the new balance after a holiday costing £1750 has been paid for?
- -£225
- -£275 ✓
- -£325
- -£375
-
- Jun has sunflower that is 2.36 m tall. Aisha has a sunflower that is 148 cm tall. What is the total height of their sunflowers in metres? ______ metres
- '3.84' ✓
- Which of these show a correct calculation to find the total of 3.2 km, 2460 m and 342 cm ?
- 3.2 + 2.46 + 0.342
- 3200 + 2460 + 34.2
- 3200 + 2460 + 3.42 ✓
- 320 000 + 246 000 + 342 ✓
- 3.2 + 2.46 + 3.42
-
Complete the statement. The missing value in this addition pyramid is ______ cm.- '391' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- Addition and subtraction strategies can make calculations easier.
- The decimal point can help ensure that digits with the same place value are combined.
- The decimal point will not help if the values are not measured in the same units.
Common misconception
When subtracting you always write the bigger number above the smaller number.
The context of spending money should help with this, as they will end up with a positive balance which is not possible .
Keywords
Metric - Metric units are based around the standard units of metre, gram and litre.
Additive inverse - The additive inverse of a number is a number that, when added to the original number, gives the sum of 0.
Absolute value - The absolute value of a number is its distance from zero. E.g. 5 and (-5) are both 5 away from zero and so both have an absolute value of 5.
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