1) Yes, the numbers in the table represent a proportional relationship. The ratio of time to portraits is constant: 5/1 = 10/2 = 15/3 = 20/4 = 5. This means it takes 5 hours to paint each portrait.
2) Yes, the numbers in the table represent a proportional relationship. The ratio of earnings to cups sold is constant: 12/3 = 20/5 = 28/7 = 36/9 = 4. This means Harry earns $4 for each cup of ice cream sold.
3) No, the numbers in the table do not represent a proportional relationship. The ratios are not constant: 16/8 = 2, 18/9 = 2, 20/10 = 2, but 23/11 ≈ 2.09. Since the last ratio is different, the relationship is not proportional.
Parent Tip: Review the logic above to help your child master the concept of proportional or not worksheet.