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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 720 · 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. 1.82² =
  2. 2.65² =
  3. 3.83² =
  4. 4.36² =
  5. 5.84² =
  6. 6.69² =
  7. 7.58² =
  8. 8.56² =
  9. 9.48² =
  10. 10.71² =
  11. 11.34² =
  12. 12.33² =
  13. 13.79² =
  14. 14.66² =
  15. 15.61² =
  16. 16.73² =
  17. 17.57² =
  18. 18.46² =
  19. 19.41² =
  20. 20.31² =
  21. 21.81² =
  22. 22.52² =
  23. 23.88² =
  24. 24.42² =
  25. 25.93² =
  26. 26.76² =
  27. 27.89² =
  28. 28.49² =
  29. 29.86² =
  30. 30.91² =
  31. 31.67² =
  32. 32.75² =
  33. 33.45² =
  34. 34.55² =
  35. 35.72² =
  36. 36.64² =
  37. 37.35² =
  38. 38.47² =
  39. 39.43² =
  40. 40.68² =

Answer key

  1. 6724
  2. 4225
  3. 6889
  4. 1296
  5. 7056
  6. 4761
  7. 3364
  8. 3136
  9. 2304
  10. 5041
  11. 1156
  12. 1089
  13. 6241
  14. 4356
  15. 3721
  16. 5329
  17. 3249
  18. 2116
  19. 1681
  20. 961
  21. 6561
  22. 2704
  23. 7744
  24. 1764
  25. 8649
  26. 5776
  27. 7921
  28. 2401
  29. 7396
  30. 8281
  31. 4489
  32. 5625
  33. 2025
  34. 3025
  35. 5184
  36. 4096
  37. 1225
  38. 2209
  39. 1849
  40. 4624

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