# Multiplying Consecutive Numbers

In this worksheet, students find two consecutive numbers which multiply to a given number. They round numbers so that they can calculate their answers mentally.

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Approximation to Estimate/Calculate Answers

Difficulty level:

### QUESTION 1 of 10

In this worksheet, we will learn how to find the two consecutive numbers (neighbouring numbers) that multiply together to give a given number.

Example

Find the two consecutive numbers that multiply together to give the following number.

462 = _______ × _______

You need to think of clues.

1.     You should know that 20 x 20 = 400

2.     Look at the last digit, which is 2 here.  Think of consecutive numbers that multiply to give a final digit of 2.  They are 1 and 2 or 3 and 4 or 6 and 7 or 8 and 9.

3.     Now use trial and improvement.

462 =          21           ×          22

Find the two consecutive numbers that multiply together to give the following number.

240 = _______ × _______

Find the two consecutive numbers that multiply together to give the following number.

30 = _______ × _______

Find the two consecutive numbers that multiply together to give the following number.

20 = _______ × _______

Find the two consecutive numbers that multiply together to give the following number.

552 = _______ × _______

Find the two consecutive numbers that multiply together to give the following number.

156 = _______ × _______

Find the two consecutive numbers that multiply together to give the following number.

110 = _______ × _______

Find the two consecutive numbers that multiply together to give the following number.

420 = _______ × _______

Find the two consecutive numbers that multiply together to give the following number.

380 = _______ × _______

Find the two consecutive numbers that multiply together to give the following number.

650 = _______ × _______

Find the two consecutive numbers that multiply together to give the following number.

272 = _______ × _______

• Question 1

Find the two consecutive numbers that multiply together to give the following number.

240 = _______ × _______

15
16
• Question 2

Find the two consecutive numbers that multiply together to give the following number.

30 = _______ × _______

5
6
• Question 3

Find the two consecutive numbers that multiply together to give the following number.

20 = _______ × _______

4
5
• Question 4

Find the two consecutive numbers that multiply together to give the following number.

552 = _______ × _______

23
24
• Question 5

Find the two consecutive numbers that multiply together to give the following number.

156 = _______ × _______

12
13
• Question 6

Find the two consecutive numbers that multiply together to give the following number.

110 = _______ × _______

10
11
• Question 7

Find the two consecutive numbers that multiply together to give the following number.

420 = _______ × _______

20
21
• Question 8

Find the two consecutive numbers that multiply together to give the following number.

380 = _______ × _______

19
20
• Question 9

Find the two consecutive numbers that multiply together to give the following number.

650 = _______ × _______

25
26
• Question 10

Find the two consecutive numbers that multiply together to give the following number.

272 = _______ × _______

16
17
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