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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 512 · 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. 1.35² =
  2. 2.97² =
  3. 3.99² =
  4. 4.38² =
  5. 5.45² =
  6. 6.73² =
  7. 7.86² =
  8. 8.84² =
  9. 9.85² =
  10. 10.68² =
  11. 11.81² =
  12. 12.83² =
  13. 13.95² =
  14. 14.59² =
  15. 15.31² =
  16. 16.48² =
  17. 17.94² =
  18. 18.39² =
  19. 19.77² =
  20. 20.72² =
  21. 21.33² =
  22. 22.41² =
  23. 23.34² =
  24. 24.46² =
  25. 25.49² =
  26. 26.78² =
  27. 27.91² =
  28. 28.61² =
  29. 29.43² =
  30. 30.62² =
  31. 31.51² =
  32. 32.75² =
  33. 33.53² =
  34. 34.63² =
  35. 35.36² =
  36. 36.71² =
  37. 37.79² =
  38. 38.92² =
  39. 39.65² =
  40. 40.88² =

Answer key

  1. 1225
  2. 9409
  3. 9801
  4. 1444
  5. 2025
  6. 5329
  7. 7396
  8. 7056
  9. 7225
  10. 4624
  11. 6561
  12. 6889
  13. 9025
  14. 3481
  15. 961
  16. 2304
  17. 8836
  18. 1521
  19. 5929
  20. 5184
  21. 1089
  22. 1681
  23. 1156
  24. 2116
  25. 2401
  26. 6084
  27. 8281
  28. 3721
  29. 1849
  30. 3844
  31. 2601
  32. 5625
  33. 2809
  34. 3969
  35. 1296
  36. 5041
  37. 6241
  38. 8464
  39. 4225
  40. 7744

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