97
Mass
Remember, we learned about division by 10 and 100 earlier in part 1 of the textbook.
Example (i) 30 ÷ 10 = = 3 (ii) 200 ÷ 100 = = 2
Division by 1000 is an extension of division by 10 and 100.
Example: 3000 ÷ 1000
How many thousands are there in 3000? (How many thousands are there in 3000?)
3000 = 3 thousands
3000 = 3 x 1000
So, 3000 ÷ 1000 = 3
Division by 1000
3000 = 3
1000
3 thousands
Conversion of grams to kilograms Note to Teacher
• Recapitulate division by
10 and 100, and extend
to 1000.
Example 1: Convert 4000 g into kg
4000 g = 4 x 1000 g
= 4 x 1 kg = 4 kg
OR 4000 g = 4000 kg = 4 kg
1000
Therefore, 4000 g = 4kg
Example 2: Convert 250 g into kg.
From the conversion line,
250 g = kg
Example 3: Convert 3250 g into kg.
3250 g = 3000 g + 250 g
= 3 kg + kg
= 3 kg
1 kg 1000 g
x 1000
÷ 1000
4
1
Conversion line
1
4kg 1
2kg 3
4kg 1 kg0 kg
0 250 g 500 g 750 g 1000 g
30
10
200
100
1
4
1
4
1
4