Explain the missing part

What it is about

Solve missing-number equations and reject a plausible counting error.

Year 1 · 5–6 years · 30 challenges

Before you begin

• Count small sets and compare familiar objects.

What the class will do

1. Choose and explain · 30 challenges

   Explain the missing part

   Solve missing-number equations and reject a plausible counting error.

Using it in class

Teacher reads equations aloud using missing number and equals. Use counters or a drawn number line to check if needed. Find what each unknown represents before choosing an operation. Explanations distinguish a starting amount, a change and a result; no negative numbers or formal written methods.

Give everyone time to think and discuss before one pupil acts at the board. The class explains and confirms together; hints and explanations stay until you move on.

Use an up-to-date browser on a computer connected to a whiteboard or shared display. Touch, mouse and keyboard; optional audio and reduced motion. No pupil accounts or personal devices.

Choose from 5 challenges up to the full activity. Discussion determines the duration: you set the pace.