Year 4 Maths: Doubling and Tripling

What is Doubling?

Doubling means adding a number to itself. When we double a number, we get twice that number.

Example of Doubling

• If we have 3 apples and we double that, we would have:$$3 + 3 = 6$$

So, double of 3 is 6.

Key Rule for Doubling

To double a number, simply multiply it by 2.

Doubling Table

| Number | Double |

|——–|——–|

| 1 | 2 |

| 2 | 4 |

| 3 | 6 |

| 4 | 8 |

| 5 | 10 |

Tips for Doubling

• Skip counting: You can count by 2s to help remember.
• Use fingers: If you have 4 fingers on one hand, you can double it by using the other hand.

What is Tripling?

Tripling means adding a number to itself two times. When we triple a number, we get three times that number.

Example of Tripling

• If we have 4 oranges and we triple that, we would have:$$4 + 4 + 4 = 12$$

So, triple of 4 is 12.

Key Rule for Tripling

To triple a number, simply multiply it by 3.

Tripling Table

| Number | Triple |

|——–|——–|

| 1 | 3 |

| 2 | 6 |

| 3 | 9 |

| 4 | 12 |

| 5 | 15 |

Tips for Tripling

• Use groups: Think of 3 groups of the same number to help visualize.
• Draw pictures: You can draw three circles and put the number of items in each circle.

Practice Questions

Easy Level Questions

1. What is double of 2?
2. What is double of 5?
3. What is tripling 1?
4. What is tripling 2?
5. What is double of 10?
6. What is double of 8?
7. What is triple of 3?
8. What is triple of 4?
9. What is double of 6?
10. What is double of 7?
11. What is triple of 1?
12. What is triple of 2?
13. What is double of 0?
14. What is double of 9?
15. What is triple of 5?
16. What is triple of 6?
17. What is double of 3?
18. What is double of 11?
19. What is triple of 0?
20. What is triple of 7?

Medium Level Questions

1. What is double of 12?
2. What is tripling 9?
3. If you double 4 and then add 2, what do you get?
4. If you triple 2 and then subtract 1, what do you get?
5. What is double of 15?
6. What is triple of 10?
7. What is double of 14?
8. If you double 6 and then add 4, what do you get?
9. If you triple 3 and then subtract 2, what do you get?
10. What is double of 20?
11. What is triple of 8?
12. If you double 5 and then subtract 3, what do you get?
13. If you triple 4 and then add 5, what do you get?
14. What is double of 18?
15. What is triple of 15?
16. If you double 7 and then add 1, what do you get?
17. If you triple 6 and then subtract 3, what do you get?
18. What is double of 11?
19. What is triple of 12?
20. If you double 9 and then add 2, what do you get?

Hard Level Questions

1. What is double of 25?
2. What is triple of 25?
3. If you double 18 and then subtract 10, what do you get?
4. If you triple 7 and then add 6, what do you get?
5. What is double of 30?
6. What is triple of 40?
7. If you double 22 and then subtract 5, what do you get?
8. If you triple 20 and then add 10, what do you get?
9. What is double of 50?
10. What is triple of 35?
11. If you double 27 and then subtract 8, what do you get?
12. If you triple 15 and then subtract 10, what do you get?
13. What is double of 45?
14. What is triple of 50?
15. If you double 33 and then add 9, what do you get?
16. If you triple 28 and then subtract 4, what do you get?
17. What is double of 60?
18. What is triple of 55?
19. If you double 29 and then add 1, what do you get?
20. If you triple 21 and then add 3, what do you get?

Answers

Easy Level Answers

1. 4
2. 10
3. 3
4. 6
5. 20
6. 16
7. 9
8. 12
9. 12
10. 14
11. 3
12. 6
13. 0
14. 18
15. 15
16. 18
17. 6
18. 22
19. 0
20. 21

Medium Level Answers

1. 24
2. 27
3. 10
4. 5
5. 30
6. 30
7. 28
8. 16
9. 40
10. 24
11. 12
12. 7
13. 17
14. 36
15. 45
16. 15
17. 22
18. 36
19. 20
20. 20

Hard Level Answers

1. 50
2. 75
3. 26
4. 27
5. 60
6. 120
7. 39
8. 70
9. 100
10. 105
11. 46
12. 35
13. 90
14. 150
15. 75
16. 80
17. 120
18. 165
19. 59
20. 66

Remember, practice makes perfect! Keep working on doubling and tripling, and you’ll get better and faster at it!