CBSE · Class 6-12

Class 8 · Ganita Prakash

Unit 7 · Class 8Ganita Prakash

Proportional Reasoning-1

Ratio, proportion, unitary method, and direct variation.

Lessons

3 concepts

1
Working with Ratios
Reduce to simplest form: $12:18 \to 2:3$ . Same units on both sides. Compare via cross-multiplication.
2
Unitary Method
10 books cost ₹200. 1 book: ₹20. 15 books: ₹300. Always find per-unit rate first.
3
Direct Variation Recognition
If doubling $x$ doubles $y$ , they're in direct variation. Otherwise not.

Skills to practise

Skill · medium

Proportional Reasoning-1 — Practice