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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 208 · 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. 1.41² =
  2. 2.81² =
  3. 3.97² =
  4. 4.78² =
  5. 5.37² =
  6. 6.74² =
  7. 7.42² =
  8. 8.77² =
  9. 9.66² =
  10. 10.44² =
  11. 11.71² =
  12. 12.64² =
  13. 13.94² =
  14. 14.49² =
  15. 15.92² =
  16. 16.84² =
  17. 17.35² =
  18. 18.79² =
  19. 19.91² =
  20. 20.43² =
  21. 21.63² =
  22. 22.32² =
  23. 23.31² =
  24. 24.36² =
  25. 25.72² =
  26. 26.73² =
  27. 27.99² =
  28. 28.95² =
  29. 29.48² =
  30. 30.54² =
  31. 31.89² =
  32. 32.96² =
  33. 33.93² =
  34. 34.82² =
  35. 35.87² =
  36. 36.47² =
  37. 37.68² =
  38. 38.53² =
  39. 39.67² =
  40. 40.33² =

Answer key

  1. 1681
  2. 6561
  3. 9409
  4. 6084
  5. 1369
  6. 5476
  7. 1764
  8. 5929
  9. 4356
  10. 1936
  11. 5041
  12. 4096
  13. 8836
  14. 2401
  15. 8464
  16. 7056
  17. 1225
  18. 6241
  19. 8281
  20. 1849
  21. 3969
  22. 1024
  23. 961
  24. 1296
  25. 5184
  26. 5329
  27. 9801
  28. 9025
  29. 2304
  30. 2916
  31. 7921
  32. 9216
  33. 8649
  34. 6724
  35. 7569
  36. 2209
  37. 4624
  38. 2809
  39. 4489
  40. 1089

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