These are the 3-mark questions — worth more because they mix two or three ideas from earlier chapters into one problem. There is no new maths here, just old skills working together. Finish this and you complete the whole book!
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A 3-mark question usually needs TWO calculations, not one. Do the first one fully before you touch the second.
Finding a far-away term in a pattern is faster with a formula than by counting one by one.
🔑 The nth-term shortcut
If a pattern starts at a and adds the same gap d each time, the value at position n is: a + (n − 1) × d.
Example: 5, 11, 17, 23 … starts at 5 and adds 6 each time. The 10th term is 5 + (10 − 1) × 6 = 5 + 54 = 59.
A shape hiding inside another shape is a classic Achievers trick — draw it on rough paper if it helps.
12 Achievers-style questions mixing everything from the book. Finish this and the whole IMO Class 5 book is complete! 🎉
