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Maths · Grade 3 · Set C
Estimate, compare and solve
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C
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Goal: 15 min
Score/ 11
Remember: Read the mark the top reaches. An estimate is close, not exact: pick the nearest mark. A level balance means the same mass.

Read the mark

1
The bars show how many liters are in each jug. How many more liters are in Jug C than in Jug B?
2
How many liters do all three jugs hold together?
3
The dot shows where a scale pointer stops. How many grams is it?
4
The pointer is at the dot. About how many grams is it?
about 400 gabout 300 gabout 500 g
5
The dot is at 80 kg.
TrueFalse
6
Which could have a mass of about 2 kg?
✏️a pencil🥔a bag of potatoes🚗a car

Solve it

7
Each brick has a mass of 400 g. The balance is level. What is the mass of the backpack, in grams?
8
Pip pours 3 buckets of 4 L into a 20 L tank. How many more liters does the tank need?
9
A bag is 4 kg. Lunch is 2 kg and a book is 3 kg. How many kilograms is that in all?
10
4 friends share 36 L of juice equally. How many liters does each friend get?
11
Join each thing to the unit that fits it best.
  1. 1water in a kettle
  2. 2a paper clip
  3. 3a big dog
  • Agrams
  • Bkilograms
  • Cliters
12
The dot is between 40 and 50. Write how you know if it is about 40 kg or about 50 kg.
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Answer key · Set C
Estimate, compare and solve
17 Jug C has 11 L and Jug B has 4 L. 11 - 4 = 7 L.
224 9 + 4 + 11 = 24 L.
31750 Each step is 250 g. The pointer is one step before 2000, so it is 1750 g.
4about 400 g The dot is between 300 and 400. It is much closer to 400, so it is about 400 g.
5False The dot is on the mark 70, so it is at 70 kg.
6a bag of potatoes A pencil is only a few grams and a car is far heavier. A bag of potatoes is about 2 kg.
71200 The backpack balances 3 bricks. 400 × 3 = 1200 g.
88 3 buckets are 4 + 4 + 4 = 12 L. 20 - 12 = 8 L.
99 4 + 2 + 3 = 9 kg.
109 36 L shared into 4 equal parts: 36 / 4 = 9 L.
111-C, 2-A, 3-B A kettle holds liquid. A paper clip is very light. A big dog is heavy.
12Your own words: a grown-up reads it.
Mark each answer, count the right ones and write the score on the sheet.