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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 363 · 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. 1.34² =
  2. 2.41² =
  3. 3.38² =
  4. 4.52² =
  5. 5.47² =
  6. 6.55² =
  7. 7.42² =
  8. 8.35² =
  9. 9.51² =
  10. 10.63² =
  11. 11.89² =
  12. 12.99² =
  13. 13.76² =
  14. 14.71² =
  15. 15.44² =
  16. 16.31² =
  17. 17.53² =
  18. 18.86² =
  19. 19.81² =
  20. 20.61² =
  21. 21.79² =
  22. 22.65² =
  23. 23.57² =
  24. 24.37² =
  25. 25.67² =
  26. 26.32² =
  27. 27.84² =
  28. 28.73² =
  29. 29.66² =
  30. 30.77² =
  31. 31.33² =
  32. 32.87² =
  33. 33.97² =
  34. 34.82² =
  35. 35.49² =
  36. 36.72² =
  37. 37.45² =
  38. 38.54² =
  39. 39.95² =
  40. 40.39² =

Answer key

  1. 1156
  2. 1681
  3. 1444
  4. 2704
  5. 2209
  6. 3025
  7. 1764
  8. 1225
  9. 2601
  10. 3969
  11. 7921
  12. 9801
  13. 5776
  14. 5041
  15. 1936
  16. 961
  17. 2809
  18. 7396
  19. 6561
  20. 3721
  21. 6241
  22. 4225
  23. 3249
  24. 1369
  25. 4489
  26. 1024
  27. 7056
  28. 5329
  29. 4356
  30. 5929
  31. 1089
  32. 7569
  33. 9409
  34. 6724
  35. 2401
  36. 5184
  37. 2025
  38. 2916
  39. 9025
  40. 1521

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