Year 2 - Maths
Calculate the difference when information is presented in a pictogram
Calculating within 20
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will add 3 addends. They will use a strategy such as finding 2 addends to total 10 or 2 numbers to bridge though 10.
Lesson Summary
You will learn to calculate the difference when information is presented in a pictogram.
Key Notes
- A pictogram is a graph that uses pictures to represent information.
- A pictogram's key tells us what each picture represents.
- Whole − part = difference
- We can calculate the difference by counting on from the known part to the whole.
Vocabulary To Learn
- Pictogram: A way of showing data using images.
- Difference: The result of subtracting one number from another. Way in which two or more things we are comparing are not the same.
- Counting on: A mental strategy used to add numbers.
- Subtraction: To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
Common Mistakes To Avoid
- When comparing the larger to the smaller number and then the smaller to the larger number, children may record this as 15 - 8 = ? and 8 - 15 = ?
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
A pictogram is a graph that uses pictures to represent information. A pictogram's key tells us what each picture represents.
2. Use this key word in a maths sentence and explain it clearly. 'Pictogram'
A way of showing data using images. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: When comparing the larger to the smaller number and then the smaller to the larger number, children may record this as 15 - 8 = ? and 8 - 15 = ? Correction: When finding the difference, we can compare the larger to the smaller number and the smaller to the larger number. Stress that each time, we record this in the same way as subtraction isn't commutative (whole - part = part).
More Lessons In This Unit
- Add and subtract two numbers that bridge through 10 Study Guide
- Add three addends Study Guide
- Add three addends efficiently Study Guide
- Add three addends efficiently by finding two addends that total 10 Study Guide
- Add two numbers that bridge through 10 Study Guide
- Calculate the difference Study Guide
- Calculate the difference in different contexts Study Guide
- Calculate the difference when information is presented in a bar chart Study Guide
- Compare the number of objects in two sets or difference between two measures. Study Guide
- Explain that the addends can be added in any order Study Guide
- Explain what the difference is between consecutive numbers Study Guide
- Use a 'First, then, then, now' story to add three addends Study Guide
- Use knowledge of calculating within 20 to solve problems Study Guide
- Use knowledge of calculating within 20 to solve problems involving statistics Study Guide
Browse all guides in the Year 2 Maths guide library.