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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 376 · 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. 1.45² =
  2. 2.89² =
  3. 3.42² =
  4. 4.71² =
  5. 5.59² =
  6. 6.49² =
  7. 7.46² =
  8. 8.88² =
  9. 9.95² =
  10. 10.55² =
  11. 11.92² =
  12. 12.75² =
  13. 13.34² =
  14. 14.58² =
  15. 15.87² =
  16. 16.96² =
  17. 17.53² =
  18. 18.56² =
  19. 19.48² =
  20. 20.54² =
  21. 21.43² =
  22. 22.37² =
  23. 23.81² =
  24. 24.73² =
  25. 25.62² =
  26. 26.65² =
  27. 27.99² =
  28. 28.47² =
  29. 29.78² =
  30. 30.64² =
  31. 31.66² =
  32. 32.69² =
  33. 33.67² =
  34. 34.79² =
  35. 35.97² =
  36. 36.52² =
  37. 37.51² =
  38. 38.84² =
  39. 39.36² =
  40. 40.57² =

Answer key

  1. 2025
  2. 7921
  3. 1764
  4. 5041
  5. 3481
  6. 2401
  7. 2116
  8. 7744
  9. 9025
  10. 3025
  11. 8464
  12. 5625
  13. 1156
  14. 3364
  15. 7569
  16. 9216
  17. 2809
  18. 3136
  19. 2304
  20. 2916
  21. 1849
  22. 1369
  23. 6561
  24. 5329
  25. 3844
  26. 4225
  27. 9801
  28. 2209
  29. 6084
  30. 4096
  31. 4356
  32. 4761
  33. 4489
  34. 6241
  35. 9409
  36. 2704
  37. 2601
  38. 7056
  39. 1296
  40. 3249

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