Loading please wait

The smart way to improve grades

Comprehensive & curriculum aligned

Try an activity or get started for free

Change Missing Number Problems into Algebra (2)

In this worksheet, students express missing number problems algebraically.

'Change Missing Number Problems into Algebra (2)' worksheet

Key stage:  KS 2

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   Equations and Algebra

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

When we use algebra, we use letters to stand for numbers that we are trying to find.

Algebra is like a language with its own rules.

 

a stands for a number.

 

a + 2 is 2 more than the number.

a - 7 is 7 less than the number.

5a is 5 times the number. (N.B. We don't use the × sign in algebra because it looks like the letter x.)

a/4 or ¼a is a quarter of the number or the number divided by 4. (N.B. We don't use the ÷ sign in algebra.)

 

 

Example

I think of a number.

I double it and take away 5. 

Then I add this to half the original number.

I get 20.

 

Write this using algebra.

Use n for the number I think of.

 

Answer

n is the number I think of.

Double it to get 2n.

Take away 5 to get 2n - 5.

Then add this to ½n to give 2n - 5 + ½n .

This equals 20.

So we write:

2n - 5 + ½n = 20

---- OR ----

Get started for free so you can track and measure your child's progress on this activity.

What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started
laptop

Try an activity or get started for free

  • educational
  • bettfutures
  • cxa
  • pta
  • era2016
  • BDA award
  • Explore LearningTuition Partner
  • tacm