1. The average gold mine in South Africa produces 3 100 tons of gold a year. A ton is 1 000 kg. How many kilograms of gold does the average South African gold mine produce?
Solution:
- 1 ton = 1,000 kg
- 3,100 tons = 3,100 × 1,000 kg = 3,100,000 kg
Answer: 3,100,000 kg
2. It takes 540 peanuts to make 340 g of peanut butter. How many peanuts would it take to make 1 kg of peanut butter?
Solution:
- First, find how many peanuts per gram: 540 peanuts / 340 g = 1.588 peanuts per gram
- 1 kg = 1,000 g
- 1.588 peanuts/g × 1,000 g = 1,588 peanuts
Answer: 1,588 peanuts
3. The average newborn baby weighs between 2 500 g and 4 000 g. If Tshelpe was born weighing 2 979 g and Thandeka was born weighing 4 128 g, what is the difference between Tshelpe and Thandeka’s weight?
Solution:
- Difference = 4,128 g - 2,979 g = 1,149 g
Answer: 1,149 g
4. The average tree weighs 4 tons (4 000 kg). If each piece of wood from the tree weighs an average of 250 g, how many pieces of wood can be chopped from one tree?
Solution:
- 4 tons = 4,000 kg = 4,000,000 g
- Number of pieces = 4,000,000 g / 250 g = 16,000 pieces
Answer: 16,000 pieces
5. One loaf of bread needs 750 g of flour. If the bread flour is sold in 1 kg bags, how much flour do you need in 1 week? Give your answer in bread in one day.
Solution:
- 1 loaf needs 750 g of flour
- 1 week = 7 days
- Total flour needed = 7 × 750 g = 5,250 g
- 1 kg = 1,000 g
- 5,250 g = 5.25 kg
Answer: 5.25 kg
Parent Tip: Review the logic above to help your child master the concept of mass problems worksheet.
