Estimation

• What is estimation in maths?


  Estimation is using approximate values in calculations to provide an approximate answer.
• Why do we use estimation in maths?


  We use estimation to give an approximate answer rather than an exact answer.
• How do we estimate numbers in calculations?


  We estimate by rounding to 1 significant figure.
• What is the estimated sum of 47 and 30?


  • 30 + 50 = 80 (estimated)
• What is the estimated sum of 66 and 92?


  • 70 + 90 = 160 (estimated)
• What is the estimated sum of 84 and 37?


  • 80 + 40 = 120 (estimated)
• What is the estimated difference of 168 and 54?


  • 200 - 50 = 150 (estimated)
• What is the estimated difference of 181 and 124?


  • 200 - 100 = 100 (estimated)
• What is the estimated difference of 362 and 149?


  • 400 - 100 = 300 (estimated)
• What is the estimated product of 18 and 5?


  • 20 x 10 = 200 (estimated)
• What is the estimated product of 19 and 21?


  • 20 x 20 = 400 (estimated)
• What is the estimated product of 32 and 9?


  • 30 x 10 = 300 (estimated)
• How does rounding to 1 significant figure help in estimation?


  It simplifies calculations by reducing the numbers to their most significant digits.