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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.

'Multiplying Consecutive Numbers' worksheet

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Approximation to Estimate/Calculate Answers

Difficulty level:  

Worksheet Overview

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 = _______ × _______

 

Answer

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 = _______ × _______

CORRECT ANSWER
15
16
  • Question 2

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

30 = _______ × _______

CORRECT ANSWER
5
6
  • Question 3

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

20 = _______ × _______

CORRECT ANSWER
4
5
  • Question 4

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

552 = _______ × _______

CORRECT ANSWER
23
24
  • Question 5

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

156 = _______ × _______

CORRECT ANSWER
12
13
  • Question 6

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

110 = _______ × _______

CORRECT ANSWER
10
11
  • Question 7

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

420 = _______ × _______

CORRECT ANSWER
20
21
  • Question 8

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

380 = _______ × _______

CORRECT ANSWER
19
20
  • Question 9

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

650 = _______ × _______

CORRECT ANSWER
25
26
  • Question 10

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

272 = _______ × _______

CORRECT ANSWER
16
17
---- OR ----

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