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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 721 · 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. 1.31² =
  2. 2.76² =
  3. 3.37² =
  4. 4.48² =
  5. 5.99² =
  6. 6.45² =
  7. 7.81² =
  8. 8.56² =
  9. 9.61² =
  10. 10.88² =
  11. 11.83² =
  12. 12.46² =
  13. 13.59² =
  14. 14.97² =
  15. 15.34² =
  16. 16.36² =
  17. 17.82² =
  18. 18.57² =
  19. 19.89² =
  20. 20.71² =
  21. 21.67² =
  22. 22.35² =
  23. 23.68² =
  24. 24.33² =
  25. 25.93² =
  26. 26.38² =
  27. 27.73² =
  28. 28.87² =
  29. 29.47² =
  30. 30.42² =
  31. 31.86² =
  32. 32.66² =
  33. 33.62² =
  34. 34.92² =
  35. 35.58² =
  36. 36.85² =
  37. 37.41² =
  38. 38.44² =
  39. 39.72² =
  40. 40.51² =

Answer key

  1. 961
  2. 5776
  3. 1369
  4. 2304
  5. 9801
  6. 2025
  7. 6561
  8. 3136
  9. 3721
  10. 7744
  11. 6889
  12. 2116
  13. 3481
  14. 9409
  15. 1156
  16. 1296
  17. 6724
  18. 3249
  19. 7921
  20. 5041
  21. 4489
  22. 1225
  23. 4624
  24. 1089
  25. 8649
  26. 1444
  27. 5329
  28. 7569
  29. 2209
  30. 1764
  31. 7396
  32. 4356
  33. 3844
  34. 8464
  35. 3364
  36. 7225
  37. 1681
  38. 1936
  39. 5184
  40. 2601

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