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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 640 · 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. 1.74² =
  2. 2.51² =
  3. 3.56² =
  4. 4.61² =
  5. 5.46² =
  6. 6.52² =
  7. 7.48² =
  8. 8.36² =
  9. 9.67² =
  10. 10.84² =
  11. 11.83² =
  12. 12.49² =
  13. 13.91² =
  14. 14.98² =
  15. 15.82² =
  16. 16.57² =
  17. 17.86² =
  18. 18.45² =
  19. 19.59² =
  20. 20.77² =
  21. 21.81² =
  22. 22.62² =
  23. 23.85² =
  24. 24.89² =
  25. 25.71² =
  26. 26.54² =
  27. 27.42² =
  28. 28.35² =
  29. 29.93² =
  30. 30.72² =
  31. 31.58² =
  32. 32.92² =
  33. 33.65² =
  34. 34.43² =
  35. 35.39² =
  36. 36.73² =
  37. 37.95² =
  38. 38.68² =
  39. 39.41² =
  40. 40.78² =

Answer key

  1. 5476
  2. 2601
  3. 3136
  4. 3721
  5. 2116
  6. 2704
  7. 2304
  8. 1296
  9. 4489
  10. 7056
  11. 6889
  12. 2401
  13. 8281
  14. 9604
  15. 6724
  16. 3249
  17. 7396
  18. 2025
  19. 3481
  20. 5929
  21. 6561
  22. 3844
  23. 7225
  24. 7921
  25. 5041
  26. 2916
  27. 1764
  28. 1225
  29. 8649
  30. 5184
  31. 3364
  32. 8464
  33. 4225
  34. 1849
  35. 1521
  36. 5329
  37. 9025
  38. 4624
  39. 1681
  40. 6084

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