What This Drill Trains
Finding a fraction of a whole — “three-quarters of 80,” “two-fifths of 60” — connects fraction sense to everyday quantities. Fraction Frenzy focuses on unit fractions and simple composites so you practice divide-then-multiply thinking, which is also the heart of many percentage calculations.
How to Think During the Round
To find a/b of n: divide n by b to get one part, then multiply by a. Example: 3/4 of 80 → 80 ÷ 4 = 20, then 20 × 3 = 60. Prefer fractions that divide evenly in this drill; if a division feels messy, recheck that you chose the denominator as the first step.
You have 90 seconds. Accuracy still outranks raw speed: one calm method repeated well beats a streak of guesses. After the timer ends, notice which problems felt sticky — that short review is where real improvement happens.
Worked Examples
Study these before you press Start. Try to recreate the thinking without looking at the answer first.
¾ of 64
Thinking: 64 ÷ 4 = 16; 16 × 3 = 48.
Answer: 48
⅖ of 50
Thinking: 50 ÷ 5 = 10; 10 × 2 = 20.
Answer: 20
½ of 96
Thinking: Half of 96 is 48.
Answer: 48
Common Mistakes
- Multiplying by the numerator before dividing by the denominator and then getting lost.
- Swapping numerator and denominator (finding 4/3 instead of 3/4).
- Confusing “fraction of” with fraction addition.
Practice Tips
- Always say “divide by the bottom, multiply by the top.”
- Connect ½, ¼, and ⅕ to the percentage anchors you already know.
- Use the fractions & percentages lesson for mixed review after a few frenzy rounds.
Suggested Session Plan
- Read the method section once if this skill is new.
- Cover the answers and re-solve the three worked examples aloud.
- Start the timed round and stick to one strategy.
- Replay once, then write down any fact or pattern you missed.
- If the same error repeats, open the full lesson for more examples and a practice set with an answer key.
Full explanation, extra worked examples, and practice problems for this skill: open the related stage lesson .
Prefer a structured curriculum instead of random drills? Browse all learning stages or read the complete mental arithmetic guide . More timed drills live on the games hub.