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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 786 · 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. 1.55² =
  2. 2.89² =
  3. 3.81² =
  4. 4.85² =
  5. 5.32² =
  6. 6.94² =
  7. 7.66² =
  8. 8.68² =
  9. 9.39² =
  10. 10.63² =
  11. 11.86² =
  12. 12.54² =
  13. 13.59² =
  14. 14.61² =
  15. 15.87² =
  16. 16.42² =
  17. 17.52² =
  18. 18.71² =
  19. 19.43² =
  20. 20.95² =
  21. 21.91² =
  22. 22.82² =
  23. 23.84² =
  24. 24.45² =
  25. 25.97² =
  26. 26.51² =
  27. 27.36² =
  28. 28.96² =
  29. 29.38² =
  30. 30.47² =
  31. 31.92² =
  32. 32.64² =
  33. 33.53² =
  34. 34.56² =
  35. 35.67² =
  36. 36.83² =
  37. 37.65² =
  38. 38.88² =
  39. 39.73² =
  40. 40.69² =

Answer key

  1. 3025
  2. 7921
  3. 6561
  4. 7225
  5. 1024
  6. 8836
  7. 4356
  8. 4624
  9. 1521
  10. 3969
  11. 7396
  12. 2916
  13. 3481
  14. 3721
  15. 7569
  16. 1764
  17. 2704
  18. 5041
  19. 1849
  20. 9025
  21. 8281
  22. 6724
  23. 7056
  24. 2025
  25. 9409
  26. 2601
  27. 1296
  28. 9216
  29. 1444
  30. 2209
  31. 8464
  32. 4096
  33. 2809
  34. 3136
  35. 4489
  36. 6889
  37. 4225
  38. 7744
  39. 5329
  40. 4761

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