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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 21 · 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. 2.39² =
  3. 3.73² =
  4. 4.89² =
  5. 5.72² =
  6. 6.98² =
  7. 7.63² =
  8. 8.36² =
  9. 9.79² =
  10. 10.97² =
  11. 11.42² =
  12. 12.82² =
  13. 13.81² =
  14. 14.85² =
  15. 15.86² =
  16. 16.92² =
  17. 17.74² =
  18. 18.51² =
  19. 19.44² =
  20. 20.75² =
  21. 21.69² =
  22. 22.67² =
  23. 23.58² =
  24. 24.95² =
  25. 25.45² =
  26. 26.47² =
  27. 27.54² =
  28. 28.49² =
  29. 29.91² =
  30. 30.71² =
  31. 31.31² =
  32. 32.57² =
  33. 33.41² =
  34. 34.84² =
  35. 35.88² =
  36. 36.64² =
  37. 37.99² =
  38. 38.93² =
  39. 39.35² =
  40. 40.37² =

Answer key

  1. 1156
  2. 1521
  3. 5329
  4. 7921
  5. 5184
  6. 9604
  7. 3969
  8. 1296
  9. 6241
  10. 9409
  11. 1764
  12. 6724
  13. 6561
  14. 7225
  15. 7396
  16. 8464
  17. 5476
  18. 2601
  19. 1936
  20. 5625
  21. 4761
  22. 4489
  23. 3364
  24. 9025
  25. 2025
  26. 2209
  27. 2916
  28. 2401
  29. 8281
  30. 5041
  31. 961
  32. 3249
  33. 1681
  34. 7056
  35. 7744
  36. 4096
  37. 9801
  38. 8649
  39. 1225
  40. 1369

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