Algebraic Formulae (Sec 1) Practice
Substitute values into formulae, change the subject of a formula, and construct formulae from real-world contexts. A critical skill for all of science and mathematics throughout secondary school.
Common Mistakes to Avoid
Not applying inverse operations in the correct order when changing the subject
Dividing instead of multiplying (or vice versa) when rearranging
Substituting before rearranging β always rearrange first if the subject needs to change
Practice Questions
Try each question. When you're stuck, reveal the Socratic strategy β a guided hint that teaches you how to think, not just what to write.
Given A = Β½bh, find A when b = 6 and h = 4.
Make x the subject of the formula: y = 2x + 5.
Construct a formula for the total cost C dollars of n items if each item costs $0.80 and there is a $2 delivery fee.
Parent & Tutor Insight
Changing the subject of a formula is the most transferable algebraic skill your child will learn β it's used in physics, chemistry, and every branch of mathematics. If your child masters this in Sec 1, all science subjects become significantly easier.
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