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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 299 · 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. 1.73² =
  2. 2.39² =
  3. 3.52² =
  4. 4.94² =
  5. 5.82² =
  6. 6.69² =
  7. 7.98² =
  8. 8.48² =
  9. 9.97² =
  10. 10.62² =
  11. 11.89² =
  12. 12.43² =
  13. 13.51² =
  14. 14.78² =
  15. 15.41² =
  16. 16.76² =
  17. 17.86² =
  18. 18.34² =
  19. 19.85² =
  20. 20.93² =
  21. 21.63² =
  22. 22.75² =
  23. 23.42² =
  24. 24.65² =
  25. 25.71² =
  26. 26.61² =
  27. 27.96² =
  28. 28.81² =
  29. 29.47² =
  30. 30.91² =
  31. 31.44² =
  32. 32.83² =
  33. 33.74² =
  34. 34.66² =
  35. 35.72² =
  36. 36.31² =
  37. 37.53² =
  38. 38.55² =
  39. 39.54² =
  40. 40.68² =

Answer key

  1. 5329
  2. 1521
  3. 2704
  4. 8836
  5. 6724
  6. 4761
  7. 9604
  8. 2304
  9. 9409
  10. 3844
  11. 7921
  12. 1849
  13. 2601
  14. 6084
  15. 1681
  16. 5776
  17. 7396
  18. 1156
  19. 7225
  20. 8649
  21. 3969
  22. 5625
  23. 1764
  24. 4225
  25. 5041
  26. 3721
  27. 9216
  28. 6561
  29. 2209
  30. 8281
  31. 1936
  32. 6889
  33. 5476
  34. 4356
  35. 5184
  36. 961
  37. 2809
  38. 3025
  39. 2916
  40. 4624

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