Bonds to 100 (tens and ones)

Home learning focus

Today's lesson is on number bonds to 100 using tens and ones (for example 20 + 70 = 90 or 60 + 40 = 100).

This lesson includes:

  • two animations
  • three activities

Learn

Tens and ones

First, watch the animation below. It explains how you can represent two-digit numbers using 10 and 1s. Understanding about place value is really important when you are adding and subtracting numbers.

Any two-digit number can be shown using tens and ones. For example, the number 34 can be divided into three lots of ten and four lots of one.

Number bonds

Can you remember what number bonds are? Watch this video from KS1 Maths to remind yourself.

Number bonds are a pair of numbers that add up to make another specific number. They are sometimes called number pairs.

They can show you how numbers join together and how they break down into different parts.

Practise

Activity 1

Worksheet: Number bonds to 100

This worksheet from Numbots contains three tasks about number bonds to 100. Have a go at each task and see if you can get them all correct.

Number bonds to 100

Practise

Activity 2

Worksheet: Number bonds to 100

This worksheet from Whizz Education contains one task about number bonds to 100. Have a go and see if you can get it all correct.

Number bonds to 100

Activity 3

Karate Cats

Play the addition and subtraction level of Karate Cats Maths - can you collect a cool new costume for your cats?

Game - Karate Cats Maths

There's more to learn...

Have a look at these other resources around the BBC and the web.

Bitesize Daily lessons
KS1 Maths
Primary games
5 - 7 Maths
Game - Karate Cats Maths
Play It!