› Proportional Reasoning-1 — part 1
› Proportional Reasoning-1 — part 2
› Proportional Reasoning-1 — part 3
› Proportional Reasoning-1 — part 4
› Proportional Reasoning-1 — part 5
› Proportional Reasoning-1 — part 6
› Proportional Reasoning-1 — part 7
› Proportional Reasoning-1 — part 8
› Proportional Reasoning-1 — part 9
› Proportional Reasoning-1 — part 10
› Proportional Reasoning-1 — part 11
› Proportional Reasoning-1 — part 12
› Proportional Reasoning-1 — part 13
› Per Cent Means Out of a Hundred
› Three Methods for Turning a Fraction into a Percentage
› Figure it Out: Six Fractions, Nandini's Marbles, and the Long-Distance Run
› Why 100 and Not 10 or 43, and Where 'Per Hundred' Came From
› 1.2 Percentage of Some Quantity: Who Ate More Sugar?
› Free-hand Computations: The Mental Percentage Table
› The FDP Trio: Fractions, Decimals and Percentages
› Three Routes to 60 Marks, and the Millet Kanji Ratio
› Four Ways to Finish the Ride to Agra
› Word Problems, and 1.3 Using Percentages to Compare Proportions
› Percentage Decrease, and What Cost Price, Marked Price and Selling Price Mean
› 3.1 A Quick Recap: Testing Two Ratios by Cross-Multiplication
› 3.3 Ratios with More than Two Terms: The Spice Mix
› 3.4 Dividing a Whole in a Given Ratio: Concrete and Paint
› Interest, Compounding, and Why 6000 Becomes 7986
› The General Formulas: p(1 + rt) and p(1 + r) Multiplied t Times
› 3.6 Inverse Proportions: When More Means Less
› The Rule xy = k, and Checking It on the Table
› Figure it Out: Spotting Inverse Proportion in a Table
› Pumps, Provisions, and Two People Working Together
› Figure it Out: Which Pairs Are Inverse, and Reading Sleep Charts
› Two Pumps Together, Machines, Speed, and the Summary
› Figure it Out: A Transport Pie Chart, Painters, Tanks and Chairs
› The Unitary Method in Everyday Problems
› Time and Work: How Long Will the Job Take
› Speed, Distance and Time