Year 2 - Maths
Compare two-digit numbers
Comparing, ordering and partitioning 2-digit numbers
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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 compare two 2-digit numbers and partition a 2-digit number into 10s and 1s and position on a number line.
Lesson Summary
You will learn to compare two-digit numbers.
Key Notes
- When comparing two-digit numbers, the number of tens can be compared to find the greater number.
- When the tens in the numbers are the same, the greater number can be found by comparing the number of ones.
- The greater number can also be found using a number line.
- The greater number comes further in the counting sequence, so it will be further along the number line.
Vocabulary To Learn
- Compare: You compare to find out what is the same and what is different. You can compare numbers to find out if one is greater than or less than another.
- Greater than: Is larger in value or size.
- Less than: Is smaller in value or size, referring to an abstract or continuous number.
Common Mistakes To Avoid
- Children may think that they must see both the tens and ones in a two-digit number to compare them. They may also reverse the tens and ones and compare the ones first.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
When comparing two-digit numbers, the number of tens can be compared to find the greater number. When the tens in the numbers are the same, the greater number can be found by comparing the number of ones.
2. Use this key word in a maths sentence and explain it clearly. 'Compare'
You compare to find out what is the same and what is different. You can compare numbers to find out if one is greater than or less than another. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children may think that they must see both the tens and ones in a two-digit number to compare them. They may also reverse the tens and ones and compare the ones first. Correction: Ensure that numbers with the ones digit hidden are given to compare so that children can appreciate the relative size of the numbers. Use practical equipment and stem sentences to consolidate understanding of the structure of two-digit numbers.
More Lessons In This Unit
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