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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 65 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.75² =
  2. 2.67² =
  3. 3.89² =
  4. 4.79² =
  5. 5.77² =
  6. 6.73² =
  7. 7.81² =
  8. 8.99² =
  9. 9.76² =
  10. 10.63² =
  11. 11.37² =
  12. 12.51² =
  13. 13.62² =
  14. 14.54² =
  15. 15.48² =
  16. 16.71² =
  17. 17.68² =
  18. 18.47² =
  19. 19.94² =
  20. 20.41² =
  21. 21.35² =
  22. 22.72² =
  23. 23.61² =
  24. 24.31² =
  25. 25.95² =
  26. 26.82² =
  27. 27.69² =
  28. 28.86² =
  29. 29.32² =
  30. 30.64² =
  31. 31.34² =
  32. 32.84² =
  33. 33.98² =
  34. 34.91² =
  35. 35.36² =
  36. 36.52² =
  37. 37.66² =
  38. 38.93² =
  39. 39.38² =
  40. 40.97² =

Answer key

  1. 5625
  2. 4489
  3. 7921
  4. 6241
  5. 5929
  6. 5329
  7. 6561
  8. 9801
  9. 5776
  10. 3969
  11. 1369
  12. 2601
  13. 3844
  14. 2916
  15. 2304
  16. 5041
  17. 4624
  18. 2209
  19. 8836
  20. 1681
  21. 1225
  22. 5184
  23. 3721
  24. 961
  25. 9025
  26. 6724
  27. 4761
  28. 7396
  29. 1024
  30. 4096
  31. 1156
  32. 7056
  33. 9604
  34. 8281
  35. 1296
  36. 2704
  37. 4356
  38. 8649
  39. 1444
  40. 9409

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