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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 649 · 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. 1.87² =
  2. 2.39² =
  3. 3.66² =
  4. 4.43² =
  5. 5.86² =
  6. 6.48² =
  7. 7.51² =
  8. 8.46² =
  9. 9.44² =
  10. 10.91² =
  11. 11.69² =
  12. 12.67² =
  13. 13.32² =
  14. 14.84² =
  15. 15.61² =
  16. 16.79² =
  17. 17.57² =
  18. 18.63² =
  19. 19.85² =
  20. 20.47² =
  21. 21.94² =
  22. 22.56² =
  23. 23.92² =
  24. 24.42² =
  25. 25.81² =
  26. 26.71² =
  27. 27.54² =
  28. 28.65² =
  29. 29.97² =
  30. 30.45² =
  31. 31.99² =
  32. 32.33² =
  33. 33.83² =
  34. 34.53² =
  35. 35.31² =
  36. 36.75² =
  37. 37.36² =
  38. 38.73² =
  39. 39.98² =
  40. 40.77² =

Answer key

  1. 7569
  2. 1521
  3. 4356
  4. 1849
  5. 7396
  6. 2304
  7. 2601
  8. 2116
  9. 1936
  10. 8281
  11. 4761
  12. 4489
  13. 1024
  14. 7056
  15. 3721
  16. 6241
  17. 3249
  18. 3969
  19. 7225
  20. 2209
  21. 8836
  22. 3136
  23. 8464
  24. 1764
  25. 6561
  26. 5041
  27. 2916
  28. 4225
  29. 9409
  30. 2025
  31. 9801
  32. 1089
  33. 6889
  34. 2809
  35. 961
  36. 5625
  37. 1296
  38. 5329
  39. 9604
  40. 5929

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