Kung Fu MathKung Fu Math数学道場 · Math Dojo
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½

流 · Fractions

Scroll of Flow

A fraction is a number of equal pieces. The bottom says how big each piece is, the top says how many you have.

01

Same Size Pieces

With the same denominator, only the tops change. The piece size stays the same.

3/8 + 2/8

  1. → Pieces are eighths
  2. → 3 + 2 = 5 eighths

Answer: 5/8

1/2 = 0,51/4 = 0,251/5 = 0,2

Practice: Try 5/6 − 4/6 and 2/9 + 5/9.

02

Common Ground

Different denominators? Cut both into the same size pieces first. Multiply the denominators if you see no smaller match.

2/3 − 1/4

  1. → Twelfths fit both
  2. → 2/3 = 8/12, 1/4 = 3/12
  3. → 8/12 − 3/12 = 5/12

Answer: 5/12

Practice: Try 1/2 + 1/3 and 3/4 − 1/6.

03

Straight Strike

Multiplying fractions is the easy one: top times top, bottom times bottom. Then simplify.

4/5 × 2/4

  1. → 4 × 2 = 8, 5 × 4 = 20
  2. → 8/20 — divide both by 4

Answer: 2/5

Dividing? Flip the second fraction and multiply: 1/2 ÷ 1/4 = 1/2 × 4/1 = 2.

Practice: Try 2/3 × 3/4 and 3/5 ÷ 3/10.

Into the dojo

Practise with the Flow ½ technique from orange belt.

Kung Fu Math Junior
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