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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 198 · 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. 1.93² =
  2. 2.41² =
  3. 3.62² =
  4. 4.77² =
  5. 5.51² =
  6. 6.56² =
  7. 7.79² =
  8. 8.84² =
  9. 9.67² =
  10. 10.39² =
  11. 11.48² =
  12. 12.35² =
  13. 13.66² =
  14. 14.75² =
  15. 15.61² =
  16. 16.45² =
  17. 17.76² =
  18. 18.42² =
  19. 19.44² =
  20. 20.49² =
  21. 21.81² =
  22. 22.36² =
  23. 23.92² =
  24. 24.87² =
  25. 25.89² =
  26. 26.78² =
  27. 27.74² =
  28. 28.38² =
  29. 29.91² =
  30. 30.69² =
  31. 31.88² =
  32. 32.99² =
  33. 33.54² =
  34. 34.68² =
  35. 35.64² =
  36. 36.95² =
  37. 37.85² =
  38. 38.47² =
  39. 39.55² =
  40. 40.83² =

Answer key

  1. 8649
  2. 1681
  3. 3844
  4. 5929
  5. 2601
  6. 3136
  7. 6241
  8. 7056
  9. 4489
  10. 1521
  11. 2304
  12. 1225
  13. 4356
  14. 5625
  15. 3721
  16. 2025
  17. 5776
  18. 1764
  19. 1936
  20. 2401
  21. 6561
  22. 1296
  23. 8464
  24. 7569
  25. 7921
  26. 6084
  27. 5476
  28. 1444
  29. 8281
  30. 4761
  31. 7744
  32. 9801
  33. 2916
  34. 4624
  35. 4096
  36. 9025
  37. 7225
  38. 2209
  39. 3025
  40. 6889

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