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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 657 · 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. 1.69² =
  2. 2.73² =
  3. 3.56² =
  4. 4.55² =
  5. 5.68² =
  6. 6.93² =
  7. 7.43² =
  8. 8.48² =
  9. 9.58² =
  10. 10.49² =
  11. 11.67² =
  12. 12.75² =
  13. 13.65² =
  14. 14.46² =
  15. 15.38² =
  16. 16.81² =
  17. 17.94² =
  18. 18.45² =
  19. 19.96² =
  20. 20.44² =
  21. 21.42² =
  22. 22.71² =
  23. 23.78² =
  24. 24.88² =
  25. 25.79² =
  26. 26.36² =
  27. 27.87² =
  28. 28.57² =
  29. 29.53² =
  30. 30.86² =
  31. 31.51² =
  32. 32.91² =
  33. 33.32² =
  34. 34.54² =
  35. 35.95² =
  36. 36.64² =
  37. 37.99² =
  38. 38.41² =
  39. 39.62² =
  40. 40.39² =

Answer key

  1. 4761
  2. 5329
  3. 3136
  4. 3025
  5. 4624
  6. 8649
  7. 1849
  8. 2304
  9. 3364
  10. 2401
  11. 4489
  12. 5625
  13. 4225
  14. 2116
  15. 1444
  16. 6561
  17. 8836
  18. 2025
  19. 9216
  20. 1936
  21. 1764
  22. 5041
  23. 6084
  24. 7744
  25. 6241
  26. 1296
  27. 7569
  28. 3249
  29. 2809
  30. 7396
  31. 2601
  32. 8281
  33. 1024
  34. 2916
  35. 9025
  36. 4096
  37. 9801
  38. 1681
  39. 3844
  40. 1521

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