Sum of Ages: Lisa and Tom

easyGrade 2-4sum of-ages

The Problem

Lisa is 10 years old and Tom is 21 years old. What is the sum of their ages?

Answer:

31 years

Key Information

  • Lisa's age: 10 years
  • Tom's age: 21 years

Step-by-Step Solution

1

Identify both ages

Lisa = 10 years, Tom = 21 years
2

Set up equation

Sum = Lisa's age + Tom's age
3

Substitute values

Sum = 10 + 21
4

Calculate

10 + 21 = 31
5

Final answer

The sum of their ages is 31 years

Common Mistakes to Avoid

  • Adding wrong numbers
  • Missing one of the ages

Helpful Tips

  • Write down both ages before adding
  • Check your addition twice

Real-World Application

Adding ages is common when calculating combined ages for tickets, events, or family statistics.

Related Topics:

ageadditionsumword problems

Need More Help with Word Problems?

Get personalized 1-on-1 tutoring with expert math tutors. Master word problems, build problem-solving skills, and boost your confidence!

Find Your Math Tutor