Basic Arithmetic

Basic Arithmetic covers fundamental mathematical operations including addition, subtraction, multiplication, and division.

Study Strategies

Estimation and Mental Math

Quick Math on the Go

Sometimes you don't need an exact answer—just a close guess! Estimation and mental math help you solve problems quickly in your head.

How to Estimate

  • Round numbers up or down to make them easier
  • Add or subtract the rounded numbers

Why Mental Math Is Useful

  • Great for quick decisions
  • Helps you check if your answer makes sense

Try rounding prices or numbers when shopping or planning so you can figure things out super fast!

Examples

  • Rounding 29 to 30 and 52 to 50, then adding: 30 + 50 = 80

  • Estimating the total cost of 3 items that are about $5 each: 3 × 5 = $15