RemeliaMaths Year 4 Measurement
Year 4 measurement: six questions and the common mistakes
Under each answer are the wrong answers a child often gives to it, six different mistakes on this page, and what Remelia tells the child who gives one.
Questions written by Remelia for the objectives of the national curriculum for England; not taken from any test paper.
Six questions
-
How many millilitres of lemonade are in the jug?
- A 200 ml
- B 500 ml
- C 600 ml
- D 400 ml
Show the answer to question 1
Answer: D · 400 ml
Why:
The numbered marks go up in 1 l, which is 1,000 ml. Nine unnumbered marks split each gap into ten equal steps, so each mark is 1,000 ÷ 10 = 100 ml.
The top of the lemonade is four marks up from the bottom: 4 × 100 = 400 ml.
Common mistakes:
- 4,000: Your digits are right, but in the wrong columns: your answer is 10 times too big.
- 40: Your digits are right, but in the wrong columns: your answer is 10 times too small.
-
A rectangle is 11 cm long and 6 cm wide.
What is its perimeter?
Show the answer to question 2
Answer: 34 cm
Why:
Perimeter = 2 × (11 + 6) = 2 × 17 = 34 cm.
Common mistakes:
- 66: That is the area: the length multiplied by the width. The perimeter is the distance all the way round, so add up every side.
-
Which is the same time as 00:40?
- A 2:40 pm
- B 12:40 pm
- C 12:40 am
- D 2:40 am
Show the answer to question 3
Answer: C · 12:40 am
Why:
00:40 is 40 minutes after midnight, the start of the day, so it is am. The hour 00 is written 12: 12:40 am.
Common mistakes:
- B · 12:40 pm: It looks as if you swapped am and pm at 12. Midnight starts the day, so 00:30 is 12:30 am; midday starts the afternoon, so 12:30 is 12:30 pm.
-
Jonah says: 39 cm is 3.9 m.
Is Jonah right? Write the correct answer, not just yes or no.
Show the answer to question 4
Answer: 0.39 m · "No, 0.39 m" is right too; "No" on its own scores nothing
Why:
100 cm = 1 m, so 39 ÷ 100 = 0.39 m.
Jonah's answer was not right: the correct answer is 0.39 m.
Common mistakes:
- 3,900: It looks as if you multiplied instead of dividing. Dividing by 10, 100 or 1,000 makes a number smaller: the digits move to the right.
- 3.9: Your digits are right, but in the wrong columns: your answer is 10 times too big.
- 0.039: Your digits are right, but in the wrong columns: your answer is 10 times too small.
-
Which is longer: 95 cm or 9.5 m?
- A 9.5 m
- B They are the same length
- C 95 cm
Show the answer to question 5
Answer: A · 9.5 m
Why:
Put both in the same unit. 9.5 m is 950 cm, which is longer than 95 cm.
Common mistakes:
- C · 95 cm: It looks as if you compared the numbers without their units. A bigger number can be a smaller amount when its unit is smaller: write both in the same unit first, then compare.
-
A bag of sand is on the kitchen scale.
How many grams does it weigh?
- A 500 g
- B 250 g
- C 1,000 g
- D 1,250 g
Show the answer to question 6
Answer: A · 500 g
Why:
The numbered marks go up in 1 kg, which is 1,000 g. Three unnumbered marks split each gap into four equal steps, so each mark is 1,000 ÷ 4 = 250 g.
The pointer is two marks past 0: 2 × 250 = 500 g.
Common mistakes:
- 5,000: Your digits are right, but in the wrong columns: your answer is 10 times too big.
- 50: Your digits are right, but in the wrong columns: your answer is 10 times too small.
Answers
- 1. D · 400 ml
- 2. 34 cm
- 3. C · 12:40 am
- 4. 0.39 m · "No, 0.39 m" is right too; "No" on its own scores nothing
- 5. A · 9.5 m
- 6. A · 500 g
How Remelia uses a mistake
When a wrong answer matches one of these mistakes, the app says what the child seems to have done before they try again, and brings the objective back on a later day.
Remelia practises maths for the child's own year group, in short sessions, and brings back on later days what they got wrong.