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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 316 · 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. 1.67² =
  2. 2.81² =
  3. 3.75² =
  4. 4.87² =
  5. 5.79² =
  6. 6.92² =
  7. 7.43² =
  8. 8.78² =
  9. 9.59² =
  10. 10.99² =
  11. 11.45² =
  12. 12.94² =
  13. 13.53² =
  14. 14.46² =
  15. 15.58² =
  16. 16.85² =
  17. 17.34² =
  18. 18.33² =
  19. 19.31² =
  20. 20.48² =
  21. 21.44² =
  22. 22.42² =
  23. 23.73² =
  24. 24.91² =
  25. 25.76² =
  26. 26.57² =
  27. 27.52² =
  28. 28.36² =
  29. 29.86² =
  30. 30.93² =
  31. 31.49² =
  32. 32.83² =
  33. 33.51² =
  34. 34.55² =
  35. 35.39² =
  36. 36.97² =
  37. 37.54² =
  38. 38.38² =
  39. 39.66² =
  40. 40.89² =

Answer key

  1. 4489
  2. 6561
  3. 5625
  4. 7569
  5. 6241
  6. 8464
  7. 1849
  8. 6084
  9. 3481
  10. 9801
  11. 2025
  12. 8836
  13. 2809
  14. 2116
  15. 3364
  16. 7225
  17. 1156
  18. 1089
  19. 961
  20. 2304
  21. 1936
  22. 1764
  23. 5329
  24. 8281
  25. 5776
  26. 3249
  27. 2704
  28. 1296
  29. 7396
  30. 8649
  31. 2401
  32. 6889
  33. 2601
  34. 3025
  35. 1521
  36. 9409
  37. 2916
  38. 1444
  39. 4356
  40. 7921

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