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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 745 · 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. 1.81² =
  2. 2.41² =
  3. 3.95² =
  4. 4.37² =
  5. 5.79² =
  6. 6.44² =
  7. 7.62² =
  8. 8.65² =
  9. 9.89² =
  10. 10.58² =
  11. 11.31² =
  12. 12.77² =
  13. 13.99² =
  14. 14.67² =
  15. 15.49² =
  16. 16.34² =
  17. 17.71² =
  18. 18.45² =
  19. 19.54² =
  20. 20.52² =
  21. 21.74² =
  22. 22.86² =
  23. 23.47² =
  24. 24.64² =
  25. 25.94² =
  26. 26.46² =
  27. 27.56² =
  28. 28.96² =
  29. 29.33² =
  30. 30.59² =
  31. 31.51² =
  32. 32.97² =
  33. 33.73² =
  34. 34.91² =
  35. 35.75² =
  36. 36.82² =
  37. 37.55² =
  38. 38.39² =
  39. 39.84² =
  40. 40.43² =

Answer key

  1. 6561
  2. 1681
  3. 9025
  4. 1369
  5. 6241
  6. 1936
  7. 3844
  8. 4225
  9. 7921
  10. 3364
  11. 961
  12. 5929
  13. 9801
  14. 4489
  15. 2401
  16. 1156
  17. 5041
  18. 2025
  19. 2916
  20. 2704
  21. 5476
  22. 7396
  23. 2209
  24. 4096
  25. 8836
  26. 2116
  27. 3136
  28. 9216
  29. 1089
  30. 3481
  31. 2601
  32. 9409
  33. 5329
  34. 8281
  35. 5625
  36. 6724
  37. 3025
  38. 1521
  39. 7056
  40. 1849

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