Maths · Angle Rules
Angle Chaser
Watch each rule prove itself, then chase the missing angle one rule at a time.
Free to use and free to share. There is no sign-up, no score, and nothing a child does here is recorded or sent anywhere. What you may do with it, in full.
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Why this works
An angle chase is a chain of rules, never a sum you can guess. The reflex is to take the number you can see away from 180 and hope, and in this picture that reflex is wrong: it is on the list of choices every time so you can watch it fail. What actually works is to look at HOW the lines meet.
Helping a child through Angle Chaser
It runs in 2 steps
- 1. Prove the rules. Drag each rule until it proves itself.
- 2. Chase it. Pick the rule, then dial the number.
Hints, least revealing first
- Do not reach for a number yet. Ask which RULE you are allowed to use, and only then work out what it gives you.
- This one takes 2 rules stacked up. Find an angle you CAN work out first, even if it is not x.
- Here the Z pair carries the angle across to the other parallel line, and only then does the straight line finish it off.
When they finish it: “Chased it down.”
11+ skill this exercise practises
It has its own page, with a worked example on it.
All maths 11+ skillsYou can reuse this. Here is exactly how far that goes
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Embed this exercise
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Angle Chaser practises one skill. Maths has 55 of them
A free diagnostic covers every maths skill and the other three subjects, and comes back with a shortlist rather than a list.