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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 260 · 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. 1.53² =
  2. 2.94² =
  3. 3.88² =
  4. 4.66² =
  5. 5.37² =
  6. 6.76² =
  7. 7.43² =
  8. 8.47² =
  9. 9.56² =
  10. 10.48² =
  11. 11.41² =
  12. 12.33² =
  13. 13.55² =
  14. 14.95² =
  15. 15.61² =
  16. 16.63² =
  17. 17.75² =
  18. 18.72² =
  19. 19.42² =
  20. 20.67² =
  21. 21.74² =
  22. 22.31² =
  23. 23.84² =
  24. 24.99² =
  25. 25.89² =
  26. 26.52² =
  27. 27.91² =
  28. 28.46² =
  29. 29.51² =
  30. 30.81² =
  31. 31.73² =
  32. 32.86² =
  33. 33.44² =
  34. 34.36² =
  35. 35.35² =
  36. 36.69² =
  37. 37.93² =
  38. 38.68² =
  39. 39.54² =
  40. 40.34² =

Answer key

  1. 2809
  2. 8836
  3. 7744
  4. 4356
  5. 1369
  6. 5776
  7. 1849
  8. 2209
  9. 3136
  10. 2304
  11. 1681
  12. 1089
  13. 3025
  14. 9025
  15. 3721
  16. 3969
  17. 5625
  18. 5184
  19. 1764
  20. 4489
  21. 5476
  22. 961
  23. 7056
  24. 9801
  25. 7921
  26. 2704
  27. 8281
  28. 2116
  29. 2601
  30. 6561
  31. 5329
  32. 7396
  33. 1936
  34. 1296
  35. 1225
  36. 4761
  37. 8649
  38. 4624
  39. 2916
  40. 1156

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