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