August 12th

12th August 2022

Estimating

Estimate the totals of these numbers. 

  • 4,282 + 2,914 
  • 5,820 + 4,793
  • 13,794 + 27,224
  • 43,034 + 21,109
  • 55,219 + 45,894
  • 14,904 + 14,320

  • When shopping Pete pick up a top costing £26.99 and shoes costing £21.50. He says, “This is roughly £25 for the top and £20 for the shoes. I won’t need more than £45.” Do you agree?

  •  Various answers. Example answers: 1) 4,300 + 2,900 or 4,000 + 3,000  3) 13,800 + 27,200 or 14,000 + 27,000

Challenge Answer

This is one of the cases where rounding down to estimate an answer does not work. Pete will need £48.49 in total. His estimate of £45 is too low and he won’t have enough money.