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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 157 · 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. 1.42² =
  2. 2.81² =
  3. 3.78² =
  4. 4.84² =
  5. 5.55² =
  6. 6.87² =
  7. 7.69² =
  8. 8.46² =
  9. 9.43² =
  10. 10.62² =
  11. 11.49² =
  12. 12.33² =
  13. 13.64² =
  14. 14.58² =
  15. 15.41² =
  16. 16.59² =
  17. 17.79² =
  18. 18.71² =
  19. 19.66² =
  20. 20.36² =
  21. 21.68² =
  22. 22.97² =
  23. 23.35² =
  24. 24.96² =
  25. 25.32² =
  26. 26.31² =
  27. 27.91² =
  28. 28.57² =
  29. 29.85² =
  30. 30.99² =
  31. 31.77² =
  32. 32.39² =
  33. 33.56² =
  34. 34.53² =
  35. 35.34² =
  36. 36.73² =
  37. 37.61² =
  38. 38.37² =
  39. 39.45² =
  40. 40.47² =

Answer key

  1. 1764
  2. 6561
  3. 6084
  4. 7056
  5. 3025
  6. 7569
  7. 4761
  8. 2116
  9. 1849
  10. 3844
  11. 2401
  12. 1089
  13. 4096
  14. 3364
  15. 1681
  16. 3481
  17. 6241
  18. 5041
  19. 4356
  20. 1296
  21. 4624
  22. 9409
  23. 1225
  24. 9216
  25. 1024
  26. 961
  27. 8281
  28. 3249
  29. 7225
  30. 9801
  31. 5929
  32. 1521
  33. 3136
  34. 2809
  35. 1156
  36. 5329
  37. 3721
  38. 1369
  39. 2025
  40. 2209

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