Capacity and weight · Usually met around P3
Grams and kilograms
Check the unit, then what one small step is.
How to do it
Method
Check the unit, then what one small step is
100 ÷ 2 = 50; 1 step past 600 = 650 g
Another way
Count every step
50, 100, 150 … 650
In full
Grams (g) and kilograms (kg) measure weight: 1 kg = 1000 g. A coin weighs a few grams, an orange about 200 g, a bag of rice 5 kg — use grams for light things and kilograms for heavy ones. To read a scale, check whether it is in grams or kilograms, then see how far apart two numbered marks are and how many small steps lie between (100 ÷ 2 = 50 g a step). Count the steps the pointer is past a number: 1 step past 600 is 650 g. Or count every step from 0.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
An orange weighs about 180 □. Which unit goes in □?
- A. g
- B. cm
- C. mL
- D. kg
Choose the right answer
Show the answer and working
Answer: A. g
An orange isn't heavy, so use grams: about 180 g.
Example 2
2 kg = □ g
Show the answer and working
Answer: 2000
1 kg = 1000 g: 2 × 1000 = 2000.
Example 3
How heavy is the thing on the scale?
Show the answer and working
Answer: 550 g
Each 100 g has 2 steps of 50 g; the pointer is 1 step past the nearest number: 550 g.
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