Year 8 · Maths · Tables and probability · Lesson 2
Two-way tables
Learn to read and complete two-way tables, build one from information in words, and use them to find fractions and probabilities.
32-minute video lesson
Teaching, worked examples and 20 practice questions solved step by step.
Watch free for a monthWhat your child will learn
- Read information from a two-way table
- Complete a two-way table using row and column totals
- Build a two-way table from written information
- Find probabilities from a two-way table
- Choose the right total for a fraction or probability
The method
- Find a row or column with only one gap.
- Gap in a total: add. Gap in a part: subtract from the total.
- Keep going until the table is full.
- Check every row and column adds up.
Key words: two-way table, row, column, total, probability.
Worked examples
The first three practice questions from the lesson, with every step.
Question 1
Complete the two-way table about favourite sports.
- Step 1: Find a row or column with one gap
- Step 2: Total, Swimming
- Step 3: Year 8, Football
- Step 4: Year 8, Swimming
- Step 5: Year 7, Netball
- Step 6: Year 7, Total
Answer: Table complete
Question 2
Complete the two-way table about pets.
- Step 1: Find a row or column with one gap
- Step 2: Total, Cat
- Step 3: Total, None
- Step 4: Girls, None
- Step 5: Girls, Dog
- Step 6: Boys, Dog
- Step 7: Boys, Total
Answer: Table complete
Question 3
Complete the two-way table about left- and right-handed pupils.
- Step 1: Find a row or column with one gap
- Step 2: Left-handed, Girls
- Step 3: Total, Girls
- Step 4: Right-handed, Boys
- Step 5: Right-handed, Girls
Answer: Table complete