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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 263 · 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. 1.84² =
  2. 2.64² =
  3. 3.51² =
  4. 4.87² =
  5. 5.81² =
  6. 6.91² =
  7. 7.61² =
  8. 8.94² =
  9. 9.41² =
  10. 10.86² =
  11. 11.42² =
  12. 12.77² =
  13. 13.39² =
  14. 14.32² =
  15. 15.55² =
  16. 16.75² =
  17. 17.44² =
  18. 18.49² =
  19. 19.33² =
  20. 20.52² =
  21. 21.35² =
  22. 22.71² =
  23. 23.31² =
  24. 24.95² =
  25. 25.66² =
  26. 26.46² =
  27. 27.83² =
  28. 28.53² =
  29. 29.99² =
  30. 30.65² =
  31. 31.47² =
  32. 32.73² =
  33. 33.37² =
  34. 34.85² =
  35. 35.56² =
  36. 36.62² =
  37. 37.63² =
  38. 38.54² =
  39. 39.69² =
  40. 40.48² =

Answer key

  1. 7056
  2. 4096
  3. 2601
  4. 7569
  5. 6561
  6. 8281
  7. 3721
  8. 8836
  9. 1681
  10. 7396
  11. 1764
  12. 5929
  13. 1521
  14. 1024
  15. 3025
  16. 5625
  17. 1936
  18. 2401
  19. 1089
  20. 2704
  21. 1225
  22. 5041
  23. 961
  24. 9025
  25. 4356
  26. 2116
  27. 6889
  28. 2809
  29. 9801
  30. 4225
  31. 2209
  32. 5329
  33. 1369
  34. 7225
  35. 3136
  36. 3844
  37. 3969
  38. 2916
  39. 4761
  40. 2304

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