Which number is the new price?
Zara found that 20% of $50 is $10 and handed me $10 as the new price. The $10 was the increase, not the result.
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1 lesson for “Percent increase and decrease”
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What does percent of really mean?
Ivan found 15% of 80 by computing 1.5 * 80 and wrote 120. He moved the decimal the wrong way when converting 15%.
Try this lessonWhy does 10% growth beat adding 10 each year?
Adding the same amount each year is linear. Multiplying by the same number each year is exponential, and the difference grows fast.
Try this lessonIs it 60 over 45 or 45 over 60?
If 60 g was expected and 45 g appeared, is that 75% or 133%? The order of the fraction is the whole lesson.
Try this lessonWhy is 3/5 the same as 60%?
Three names for the same amount, and one short chain that gets you between them. The confusion is rarely the arithmetic — it is which direction you are going.
Try this lessonWhich is bigger: sodium or chlorine?
Sodium and chlorine sit next door in the same period, but one is much larger. Decide which, then test the down-a-group trend.
Try this lessonWhy are there so few wolves and so many plants?
You said the top of the pyramid holds the most energy because it holds the biggest animals. The pyramid is wide at the bottom, and each level up holds roughly a tenth as much energy.
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