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Grade 7 simple probability worksheets

7.SP.C.7 Word problems

Printable simple probability worksheets for grade 7, aligned to Common Core standard 7.SP.C.7. Favorable over total, reduced.

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Sample problems

  1. A bag has 3 red and 5 blue marbles. What is the probability of picking a red marble, as a fraction? 3/8
  2. A bag has 4 red and 6 blue marbles. What is the probability of picking a red marble, as a fraction? 2/5
  3. A bag has 3 red and 1 blue marbles. What is the probability of picking a red marble, as a fraction? 3/4
  4. A bag has 5 red and 7 blue marbles. What is the probability of picking a red marble, as a fraction? 5/12
  5. A bag has 4 red and 2 blue marbles. What is the probability of picking a red marble, as a fraction? 2/3
  6. A bag has 4 red and 4 blue marbles. What is the probability of picking a red marble, as a fraction? 1/2
  7. A bag has 6 red and 7 blue marbles. What is the probability of picking a red marble, as a fraction? 6/13
  8. A bag has 5 red and 5 blue marbles. What is the probability of picking a red marble, as a fraction? 1/2

These eight are one sample at medium difficulty — the generator makes a different set every time.

A worked example

A bag has 3 red and 5 blue marbles. What is the probability of picking a red marble, as a fraction? 3/8

  1. Count all the marbles: 3 + 5 = 8
  2. Probability = red marbles ÷ all marbles = 3/8

Every problem on the answer key can show its steps like this — turn on “Show steps” before downloading.

About these worksheets

The wording stays familiar while the numbers change, which is what makes the method stick rather than the answer. Every sheet is generated fresh, so you can print a new one on the same skill as often as you need — different numbers, same difficulty.

Pick how many problems you want and whether they should be easy, medium or hard, then download a PDF with a matching answer key. The key can show the worked steps for every problem, which is what a parent needs to see where a wrong answer went wrong.

More grade 7 worksheets

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Word problems

Algebra

Measurement and geometry

Fractions and decimals

All 20 grade 7 skills