Use knowledge of positive and negative numbers to calculate intervals | Maths

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℃

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

Loading worksheet ...

Loading presentation ...

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.

Bridging - A strategy which uses addition or subtraction to cross a number boundary.
Partitioning - Splitting a number or object into smaller parts.