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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 769 · 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. 1.66² =
  2. 2.71² =
  3. 3.81² =
  4. 4.78² =
  5. 5.97² =
  6. 6.31² =
  7. 7.39² =
  8. 8.54² =
  9. 9.44² =
  10. 10.87² =
  11. 11.43² =
  12. 12.83² =
  13. 13.63² =
  14. 14.51² =
  15. 15.49² =
  16. 16.57² =
  17. 17.61² =
  18. 18.92² =
  19. 19.59² =
  20. 20.89² =
  21. 21.45² =
  22. 22.34² =
  23. 23.41² =
  24. 24.33² =
  25. 25.86² =
  26. 26.99² =
  27. 27.94² =
  28. 28.56² =
  29. 29.37² =
  30. 30.47² =
  31. 31.75² =
  32. 32.46² =
  33. 33.52² =
  34. 34.35² =
  35. 35.36² =
  36. 36.88² =
  37. 37.42² =
  38. 38.58² =
  39. 39.84² =
  40. 40.96² =

Answer key

  1. 4356
  2. 5041
  3. 6561
  4. 6084
  5. 9409
  6. 961
  7. 1521
  8. 2916
  9. 1936
  10. 7569
  11. 1849
  12. 6889
  13. 3969
  14. 2601
  15. 2401
  16. 3249
  17. 3721
  18. 8464
  19. 3481
  20. 7921
  21. 2025
  22. 1156
  23. 1681
  24. 1089
  25. 7396
  26. 9801
  27. 8836
  28. 3136
  29. 1369
  30. 2209
  31. 5625
  32. 2116
  33. 2704
  34. 1225
  35. 1296
  36. 7744
  37. 1764
  38. 3364
  39. 7056
  40. 9216

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