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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 683 · 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. 1.36² =
  2. 2.62² =
  3. 3.84² =
  4. 4.99² =
  5. 5.61² =
  6. 6.93² =
  7. 7.81² =
  8. 8.51² =
  9. 9.34² =
  10. 10.59² =
  11. 11.48² =
  12. 12.56² =
  13. 13.49² =
  14. 14.31² =
  15. 15.75² =
  16. 16.74² =
  17. 17.45² =
  18. 18.39² =
  19. 19.95² =
  20. 20.71² =
  21. 21.32² =
  22. 22.86² =
  23. 23.98² =
  24. 24.73² =
  25. 25.64² =
  26. 26.94² =
  27. 27.53² =
  28. 28.41² =
  29. 29.44² =
  30. 30.72² =
  31. 31.89² =
  32. 32.79² =
  33. 33.33² =
  34. 34.47² =
  35. 35.76² =
  36. 36.77² =
  37. 37.85² =
  38. 38.38² =
  39. 39.43² =
  40. 40.42² =

Answer key

  1. 1296
  2. 3844
  3. 7056
  4. 9801
  5. 3721
  6. 8649
  7. 6561
  8. 2601
  9. 1156
  10. 3481
  11. 2304
  12. 3136
  13. 2401
  14. 961
  15. 5625
  16. 5476
  17. 2025
  18. 1521
  19. 9025
  20. 5041
  21. 1024
  22. 7396
  23. 9604
  24. 5329
  25. 4096
  26. 8836
  27. 2809
  28. 1681
  29. 1936
  30. 5184
  31. 7921
  32. 6241
  33. 1089
  34. 2209
  35. 5776
  36. 5929
  37. 7225
  38. 1444
  39. 1849
  40. 1764

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