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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 810 · 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. 1.39² =
  2. 2.78² =
  3. 3.43² =
  4. 4.34² =
  5. 5.59² =
  6. 6.41² =
  7. 7.91² =
  8. 8.36² =
  9. 9.63² =
  10. 10.67² =
  11. 11.85² =
  12. 12.33² =
  13. 13.72² =
  14. 14.82² =
  15. 15.49² =
  16. 16.84² =
  17. 17.56² =
  18. 18.75² =
  19. 19.45² =
  20. 20.99² =
  21. 21.92² =
  22. 22.96² =
  23. 23.64² =
  24. 24.71² =
  25. 25.94² =
  26. 26.74² =
  27. 27.44² =
  28. 28.54² =
  29. 29.58² =
  30. 30.66² =
  31. 31.35² =
  32. 32.42² =
  33. 33.81² =
  34. 34.31² =
  35. 35.68² =
  36. 36.57² =
  37. 37.61² =
  38. 38.55² =
  39. 39.52² =
  40. 40.79² =

Answer key

  1. 1521
  2. 6084
  3. 1849
  4. 1156
  5. 3481
  6. 1681
  7. 8281
  8. 1296
  9. 3969
  10. 4489
  11. 7225
  12. 1089
  13. 5184
  14. 6724
  15. 2401
  16. 7056
  17. 3136
  18. 5625
  19. 2025
  20. 9801
  21. 8464
  22. 9216
  23. 4096
  24. 5041
  25. 8836
  26. 5476
  27. 1936
  28. 2916
  29. 3364
  30. 4356
  31. 1225
  32. 1764
  33. 6561
  34. 961
  35. 4624
  36. 3249
  37. 3721
  38. 3025
  39. 2704
  40. 6241

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