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Life skills · Grades 4–8

Scale a recipe

Scale each ingredient by the same factor.

Make a worksheet

The key idea

Scale each ingredient by the same factor.

new amount = old amount × new portions / old portions

Worked examples

A recipe uses 150 g of rice for 2 portions. How many grams are needed for 20 identical portions?

150/2 × 20 = 1500

1500 g

A recipe uses 600 g of rice for 8 portions. How many grams are needed for 18 identical portions?

600/8 × 18 = 1350

1350 g

Try it yourself

  1. A recipe uses 160 g of rice for 4 portions. How many grams are needed for 8 identical portions?

  2. A recipe uses 900 g of rice for 10 portions. How many grams are needed for 19 identical portions?

Check your understanding

Answers and marking notes
  1. 320 g

    160/4 × 8 = 320

  2. 1710 g

    900/10 × 19 = 1710

Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.