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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 141 · 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. 1.51² =
  2. 2.81² =
  3. 3.71² =
  4. 4.53² =
  5. 5.41² =
  6. 6.73² =
  7. 7.89² =
  8. 8.43² =
  9. 9.74² =
  10. 10.99² =
  11. 11.79² =
  12. 12.68² =
  13. 13.72² =
  14. 14.75² =
  15. 15.64² =
  16. 16.88² =
  17. 17.57² =
  18. 18.35² =
  19. 19.76² =
  20. 20.31² =
  21. 21.97² =
  22. 22.58² =
  23. 23.61² =
  24. 24.46² =
  25. 25.32² =
  26. 26.34² =
  27. 27.36² =
  28. 28.62² =
  29. 29.85² =
  30. 30.42² =
  31. 31.56² =
  32. 32.93² =
  33. 33.91² =
  34. 34.83² =
  35. 35.82² =
  36. 36.98² =
  37. 37.69² =
  38. 38.94² =
  39. 39.84² =
  40. 40.47² =

Answer key

  1. 2601
  2. 6561
  3. 5041
  4. 2809
  5. 1681
  6. 5329
  7. 7921
  8. 1849
  9. 5476
  10. 9801
  11. 6241
  12. 4624
  13. 5184
  14. 5625
  15. 4096
  16. 7744
  17. 3249
  18. 1225
  19. 5776
  20. 961
  21. 9409
  22. 3364
  23. 3721
  24. 2116
  25. 1024
  26. 1156
  27. 1296
  28. 3844
  29. 7225
  30. 1764
  31. 3136
  32. 8649
  33. 8281
  34. 6889
  35. 6724
  36. 9604
  37. 4761
  38. 8836
  39. 7056
  40. 2209

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