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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 274 · 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. 1.36² =
  2. 2.59² =
  3. 3.41² =
  4. 4.92² =
  5. 5.58² =
  6. 6.75² =
  7. 7.66² =
  8. 8.37² =
  9. 9.49² =
  10. 10.83² =
  11. 11.89² =
  12. 12.56² =
  13. 13.84² =
  14. 14.45² =
  15. 15.31² =
  16. 16.94² =
  17. 17.53² =
  18. 18.81² =
  19. 19.54² =
  20. 20.35² =
  21. 21.62² =
  22. 22.32² =
  23. 23.73² =
  24. 24.43² =
  25. 25.61² =
  26. 26.95² =
  27. 27.91² =
  28. 28.96² =
  29. 29.87² =
  30. 30.76² =
  31. 31.44² =
  32. 32.79² =
  33. 33.67² =
  34. 34.33² =
  35. 35.85² =
  36. 36.74² =
  37. 37.97² =
  38. 38.48² =
  39. 39.65² =
  40. 40.72² =

Answer key

  1. 1296
  2. 3481
  3. 1681
  4. 8464
  5. 3364
  6. 5625
  7. 4356
  8. 1369
  9. 2401
  10. 6889
  11. 7921
  12. 3136
  13. 7056
  14. 2025
  15. 961
  16. 8836
  17. 2809
  18. 6561
  19. 2916
  20. 1225
  21. 3844
  22. 1024
  23. 5329
  24. 1849
  25. 3721
  26. 9025
  27. 8281
  28. 9216
  29. 7569
  30. 5776
  31. 1936
  32. 6241
  33. 4489
  34. 1089
  35. 7225
  36. 5476
  37. 9409
  38. 2304
  39. 4225
  40. 5184

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