Starter quiz
- Tick all of the options that show 17 partitioned into two parts.
- 13 and 5
- 9 and 8 ✓
- 2 and 15 ✓
- 12 and 5 ✓
- 8 and 7
-
- Order these temperatures from warmest to coldest.
- 1⇔20℃
- 2⇔0℃
- 3⇔−1℃
- 4⇔−10℃
- 5⇔−40℃
- Tick all the statements that are true.
- The temperature was −7℃. One hour later it was −5℃. It got colder.
- −3℃ is warmer than −4℃. ✓
- −5℃ is colder than −7℃.
- These temperatures are getting warmer as they go along: −7℃, −6℃, −4℃, −2℃ ✓
-
- Put the following numbers into descending order.
- 1⇔0.1
- 2⇔0
- 3⇔−0.01
- 4⇔−16.5
- 5⇔−17
- 38 + 49 = ______
- '87' ✓
- Tick all the temperatures that would appear in between −30℃ and −20℃ on a number line.
- −31℃
- −21℃ ✓
- −19℃
- −25℃ ✓
- −40℃
-
Exit quiz
- The temperature was 5℃ in the day. Then it dropped to −4℃ at night. What was the change in temperature? ______℃
- '9' ✓
- Izzy was on the −3rd floor of a hotel. She took the lift to the 4th floor. How many floors did she go up?
- '7' ✓
- A lift in a hotel goes up six floors from the floor marked −2. What floor is it now on?
- 4 ✓
- −8
- −4
- 8
-
- The temperature is −7℃. Calculate the new temperature if it drops by 6℃. ______℃
- '−13' ✓
- There is a temperature increase of 5℃ from −11℃. What is the new temperature? ______℃
- '-6' ✓
- A submarine is below the surface of the water at −20 m. It goes up 5 m, then down 25 m. Where is it now?
- 0
- −40 m ✓
- −30 m
- −10 m
-
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Differences between values are always positive
- Calculating differences across zero is the same as bridging through zero
Common misconception
Pupils sometimes answer a question like ‘What is the difference between −5℃ and 3℃?’ with ‘−8℃’.
Remind pupils that these differences are always positive by asking them to count forwards from the lower value to the higher value.
Keywords
Bridging - A strategy which uses addition or subtraction to cross a number boundary.
Partitioning - Splitting a number or object into smaller parts.
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