Percent of a Number

Choose a mode

Read the problem on the sign, set your answer with the − / + buttons, then press Check

3D math game · Best for grades 5-6

Percent of a Number

Percent of a Number presents a sign showing a percentage and a quantity, and students set the numeric answer using buttons. The game trains the two-step mental calculation: convert the percent to a decimal or fraction, then multiply by the whole, making percentage arithmetic fluent and fast.

What students practice

Percent of a Number builds automatic fluency with the percent-of calculation: finding 10%, 25%, 50%, and other friendly percents of a whole number. This is the computational skill that underlies discounts, tips, tax, and every real-world percentage situation.

  1. Read the percentage and the quantity shown on the sign.
  2. Calculate mentally: convert the percent to a fraction (e.g. 25% = 1/4) or multiply by the decimal form.
  3. Use the +/- buttons to set your calculated answer.
  4. Press Check to confirm.

How to use it at home or in class

For 25% of 80: students recognise 25% as one-quarter, then divide 80 by 4 to get 20. Practicing friendly percents first makes trickier values like 15% or 35% approachable by decomposition.

A common error is computing the percent value directly (writing 25 instead of 20 for 25% of 80). The game exposes this by requiring the actual quantity, not the percent symbol, training students to complete both steps of the calculation.

Use it for individual practice, paired work, or a short class demonstration before worksheets.

Start with the game above, then continue with written practice to reinforce the skill.

Common questions

What two-step calculation does this game practise?
Students convert the percent to a fraction or decimal, then multiply by the given quantity. Both steps must be done correctly to reach the right answer, building fluency with the full calculation.
Which grades is Percent of a Number for?
Grades 5-6, where students move from understanding what a percent represents to calculating a percent of a given quantity in real-world contexts.
How is this different from Percent Discount?
Percent of a Number asks for the raw percent-of result (what is 30% of 80?). Percent Discount applies that calculation to a shopping context: find the discount amount, then subtract it from the original price to get the sale price.