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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 956 · 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. 2.64² =
  3. 3.33² =
  4. 4.88² =
  5. 5.85² =
  6. 6.94² =
  7. 7.99² =
  8. 8.54² =
  9. 9.47² =
  10. 10.37² =
  11. 11.76² =
  12. 12.51² =
  13. 13.72² =
  14. 14.96² =
  15. 15.59² =
  16. 16.36² =
  17. 17.67² =
  18. 18.52² =
  19. 19.55² =
  20. 20.53² =
  21. 21.83² =
  22. 22.43² =
  23. 23.44² =
  24. 24.74² =
  25. 25.62² =
  26. 26.69² =
  27. 27.63² =
  28. 28.39² =
  29. 29.42² =
  30. 30.34² =
  31. 31.45² =
  32. 32.61² =
  33. 33.91² =
  34. 34.65² =
  35. 35.86² =
  36. 36.95² =
  37. 37.66² =
  38. 38.68² =
  39. 39.92² =
  40. 40.77² =

Answer key

  1. 5329
  2. 4096
  3. 1089
  4. 7744
  5. 7225
  6. 8836
  7. 9801
  8. 2916
  9. 2209
  10. 1369
  11. 5776
  12. 2601
  13. 5184
  14. 9216
  15. 3481
  16. 1296
  17. 4489
  18. 2704
  19. 3025
  20. 2809
  21. 6889
  22. 1849
  23. 1936
  24. 5476
  25. 3844
  26. 4761
  27. 3969
  28. 1521
  29. 1764
  30. 1156
  31. 2025
  32. 3721
  33. 8281
  34. 4225
  35. 7396
  36. 9025
  37. 4356
  38. 4624
  39. 8464
  40. 5929

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