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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 41 · 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. 1.43² =
  2. 2.98² =
  3. 3.38² =
  4. 4.81² =
  5. 5.62² =
  6. 6.47² =
  7. 7.91² =
  8. 8.45² =
  9. 9.72² =
  10. 10.51² =
  11. 11.53² =
  12. 12.63² =
  13. 13.36² =
  14. 14.93² =
  15. 15.96² =
  16. 16.89² =
  17. 17.75² =
  18. 18.54² =
  19. 19.77² =
  20. 20.84² =
  21. 21.88² =
  22. 22.68² =
  23. 23.76² =
  24. 24.42² =
  25. 25.46² =
  26. 26.35² =
  27. 27.79² =
  28. 28.34² =
  29. 29.69² =
  30. 30.33² =
  31. 31.41² =
  32. 32.58² =
  33. 33.97² =
  34. 34.71² =
  35. 35.56² =
  36. 36.85² =
  37. 37.49² =
  38. 38.92² =
  39. 39.32² =
  40. 40.48² =

Answer key

  1. 1849
  2. 9604
  3. 1444
  4. 6561
  5. 3844
  6. 2209
  7. 8281
  8. 2025
  9. 5184
  10. 2601
  11. 2809
  12. 3969
  13. 1296
  14. 8649
  15. 9216
  16. 7921
  17. 5625
  18. 2916
  19. 5929
  20. 7056
  21. 7744
  22. 4624
  23. 5776
  24. 1764
  25. 2116
  26. 1225
  27. 6241
  28. 1156
  29. 4761
  30. 1089
  31. 1681
  32. 3364
  33. 9409
  34. 5041
  35. 3136
  36. 7225
  37. 2401
  38. 8464
  39. 1024
  40. 2304

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