Success Homeschool

Primary 3 Science · Planning a fair test

Name: ______________________

Date: ____________

1. In a fair test, how many things should you change?
- ☐ (a) None
- ☐ (b) One
- ☐ (c) Two
- ☐ (d) As many as you like
2. You test which paper towel soaks up the most water. What should you keep the same?
- ☐ (a) The brand of paper towel
- ☐ (b) Nothing
- ☐ (c) The amount of water and the size of each piece
- ☐ (d) The answer
3. Why do scientists repeat a test three times?
- ☐ (a) To make it take longer
- ☐ (b) To use more materials
- ☐ (c) To change the question
- ☐ (d) To check that their results are reliable
4. On a column graph of bounce heights, what does the tallest column show?
- ☐ (a) The highest bounce
- ☐ (b) The lowest bounce
- ☐ (c) The heaviest ball
- ☐ (d) The first ball tested
5. A test asks: 'Do plants grow taller with more water?' What should be changed?
- ☐ (a) The type of plant
- ☐ (b) The amount of water
- ☐ (c) The size of the pot
- ☐ (d) The amount of light
6. Toy car results: carpet 35 cm, tiles 60 cm, grass 25 cm. Which surface had the longest roll?
7. Using the same results (carpet 35 cm, tiles 60 cm, grass 25 cm), how many centimetres further did the car roll on tiles than on carpet?
8. A test where only one thing is changed is called a f___ t___.

Answer sheet

1. One — Change only one thing so you know what caused the result.
2. The amount of water and the size of each piece — Only the type of towel changes; the water and size stay the same.
3. To check that their results are reliable — Repeating helps us trust our results.
4. The highest bounce — The tallest column stands for the biggest number.
5. The amount of water — Water is the one thing being tested, so it is what you change.
6. tiles — 60 cm is the largest number.
7. 25 — 60 − 35 = 25 cm.
8. fair test — This is a fair test.