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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 309 · 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. 1.82² =
  2. 2.33² =
  3. 3.51² =
  4. 4.84² =
  5. 5.56² =
  6. 6.46² =
  7. 7.42² =
  8. 8.76² =
  9. 9.61² =
  10. 10.99² =
  11. 11.81² =
  12. 12.79² =
  13. 13.77² =
  14. 14.83² =
  15. 15.39² =
  16. 16.65² =
  17. 17.64² =
  18. 18.67² =
  19. 19.73² =
  20. 20.41² =
  21. 21.62² =
  22. 22.91² =
  23. 23.44² =
  24. 24.88² =
  25. 25.96² =
  26. 26.89² =
  27. 27.37² =
  28. 28.35² =
  29. 29.31² =
  30. 30.68² =
  31. 31.43² =
  32. 32.95² =
  33. 33.98² =
  34. 34.38² =
  35. 35.59² =
  36. 36.49² =
  37. 37.94² =
  38. 38.47² =
  39. 39.45² =
  40. 40.92² =

Answer key

  1. 6724
  2. 1089
  3. 2601
  4. 7056
  5. 3136
  6. 2116
  7. 1764
  8. 5776
  9. 3721
  10. 9801
  11. 6561
  12. 6241
  13. 5929
  14. 6889
  15. 1521
  16. 4225
  17. 4096
  18. 4489
  19. 5329
  20. 1681
  21. 3844
  22. 8281
  23. 1936
  24. 7744
  25. 9216
  26. 7921
  27. 1369
  28. 1225
  29. 961
  30. 4624
  31. 1849
  32. 9025
  33. 9604
  34. 1444
  35. 3481
  36. 2401
  37. 8836
  38. 2209
  39. 2025
  40. 8464

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