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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 58 · 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. 1.81² =
  2. 2.42² =
  3. 3.71² =
  4. 4.72² =
  5. 5.43² =
  6. 6.61² =
  7. 7.97² =
  8. 8.84² =
  9. 9.65² =
  10. 10.67² =
  11. 11.86² =
  12. 12.98² =
  13. 13.33² =
  14. 14.35² =
  15. 15.51² =
  16. 16.39² =
  17. 17.92² =
  18. 18.85² =
  19. 19.94² =
  20. 20.45² =
  21. 21.96² =
  22. 22.53² =
  23. 23.91² =
  24. 24.32² =
  25. 25.49² =
  26. 26.41² =
  27. 27.56² =
  28. 28.31² =
  29. 29.36² =
  30. 30.62² =
  31. 31.83² =
  32. 32.95² =
  33. 33.54² =
  34. 34.88² =
  35. 35.75² =
  36. 36.74² =
  37. 37.47² =
  38. 38.66² =
  39. 39.55² =
  40. 40.64² =

Answer key

  1. 6561
  2. 1764
  3. 5041
  4. 5184
  5. 1849
  6. 3721
  7. 9409
  8. 7056
  9. 4225
  10. 4489
  11. 7396
  12. 9604
  13. 1089
  14. 1225
  15. 2601
  16. 1521
  17. 8464
  18. 7225
  19. 8836
  20. 2025
  21. 9216
  22. 2809
  23. 8281
  24. 1024
  25. 2401
  26. 1681
  27. 3136
  28. 961
  29. 1296
  30. 3844
  31. 6889
  32. 9025
  33. 2916
  34. 7744
  35. 5625
  36. 5476
  37. 2209
  38. 4356
  39. 3025
  40. 4096

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