---
title: "Mirror and Complete"
description: "Learning video: Five plus 5 is 10. The whole shape has 10 squares. To the left of the line, 7 squares are colored. How many squares does the whole shape have?"
canonical: "https://www.mathapex.app/en/math-stories/geometry/mirror-and-complete/"
language: "en"
video: "https://www.mathapex.app/media/stories/videos/en/mirror-and-complete.d87e5d9c.mp4"
duration: "PT37S"
---

# Mirror and Complete

Learning video 87 · Geometry · Grade 4 · 0:37

## Read the story

A shape is symmetrical. The line of symmetry runs down the middle.

To the left of the line, 5 squares are colored.

We mirror every square to the right. There are 5 on the right too.

Five plus 5 is 10. The whole shape has 10 squares.

**To the left of the line, 7 squares are colored. How many squares does the whole shape have?**

## Answer and working

Correct! 7 plus 7 is 14. The whole shape has 14 squares.

`7 + 7 = 14`