Which 'family' of facts is incorrect?

35 + 65 = 100 65 + 35 = 100 100 - 35 = 65 100 - 65 = 35

25 + 75 = 100 75 + 25 = 100 100 - 25 = 75 100 - 75 = 25

15 + 85 = 100 85 + 15 = 100 100 - 85 = 15 100 - 15 = 85

65 + 45 = 100 45 + 65 = 100 100 - 65 = 45 100 - 45 = 65

Which of these three other facts go with 30 + 70 = 100?

100 + 30 = 70 70 - 30 = 100 30 - 70 = 100

30 + 30 = 70 70 - 30 = 100 30 - 100 = 70

70 + 70 = 100 30 +30 = 100 100 - 100 = 30

70 + 30 = 100 100 - 30 = 70 100 - 70 = 30

KS1Maths★★ Medium

Year 2 Calculation - Addition and Subtraction Fact - Set 100

KS1 Maths: Year 2 Calculation - Addition and Subtraction Facts to 100 (Focused Practice). Timed practice with instant feedback, targeted errors, and clear next-

Written by Dr. Emma ClarkeReviewed by Daniel FosterUpdated 14 Apr 2026

Quizzes and Guides KS1 Maths

Overview

- Improve speed
- Build confidence
- Prepare for assessments

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Quiz details

Topic: 100

Questions: 8

Duration: 10 min

Difficulty: ★★ Medium

Focus: building a clean 100 method and avoiding arithmetic slips.

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Description

Year 2 Calculation - Addition and Subtraction Facts to 100 is a KS1 Maths quiz focused on Focused Practice within the Year 2 Calculation Addition And Subtraction Facts To 100 topic. Use this set to diagnose gaps quickly, then convert mistakes into specific revision actions.

This page is tuned for foundation level practice: short decision cycles, step-by-step checking, and question patterns that mirror classroom and exam-style wording. Review every wrong answer before moving on so this attempt improves both speed and method.

After finishing Focused Practice, continue with another quiz in the same cluster to compare accuracy trends. If your score drops on the next set, return to this page once more and focus only on the errors you repeated.

Topic focus: Year 2 Calculation Addition And Subtraction Facts To 100
Variant: Focused Practice
Path: KS1 / Maths

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Quiz FAQ

How should I use this Year 2 Calculation - Addition and Subtraction Fact - Set 100?

Complete the quiz once under normal timing, review every mistake, then return to the Maths subject page to try a related quiz while the topic is still fresh.

What should I do after finishing this Year 2 Calculation - Addition and Subtraction Fact - Set 100?

Use your score as a signal. If the result is strong, move to another Maths quiz for wider coverage. If the result is weak, repeat practice in the same subject before switching topics.

Is Year 2 Calculation - Addition and Subtraction Fact - Set 100 enough on its own for Maths revision?

One quiz is useful for diagnosis, but not enough on its own. The strongest approach is to combine this page with other quizzes in Maths, plus broader revision or past-paper style practice where available.