Age Problem: Lisa and her mother

easyGrade 3-5age difference

The Problem

Lisa is 31 years old. Her mother is 7 years younger than Lisa. How old is her mother?

Answer:

24 years old

Key Information

  • Lisa is 31 years old
  • her mother is 7 years younger

Step-by-Step Solution

1

Identify the given information

Lisa's age = 31 years, Age difference = 7 years
2

Set up the equation

her mother's age = Lisa's age - 7
3

Substitute values

her mother's age = 31 - 7
4

Calculate

31 - 7 = 24
5

Final answer

her mother is 24 years old

Common Mistakes to Avoid

  • Adding instead of subtracting the age difference
  • Confusing who is older or younger

Helpful Tips

  • Read the problem carefully to identify who is older
  • Subtract when someone is younger, add when they are older

Real-World Application

Age problems help understand relationships between ages and develop subtraction skills.

Related Topics:

agesubtractionword problemsbasic math

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