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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 560 · 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. 1.44² =
  2. 2.49² =
  3. 3.56² =
  4. 4.51² =
  5. 5.69² =
  6. 6.67² =
  7. 7.85² =
  8. 8.45² =
  9. 9.97² =
  10. 10.88² =
  11. 11.89² =
  12. 12.48² =
  13. 13.32² =
  14. 14.52² =
  15. 15.93² =
  16. 16.71² =
  17. 17.31² =
  18. 18.87² =
  19. 19.36² =
  20. 20.46² =
  21. 21.76² =
  22. 22.37² =
  23. 23.73² =
  24. 24.47² =
  25. 25.84² =
  26. 26.92² =
  27. 27.68² =
  28. 28.86² =
  29. 29.53² =
  30. 30.42² =
  31. 31.39² =
  32. 32.91² =
  33. 33.41² =
  34. 34.99² =
  35. 35.96² =
  36. 36.57² =
  37. 37.61² =
  38. 38.35² =
  39. 39.43² =
  40. 40.75² =

Answer key

  1. 1936
  2. 2401
  3. 3136
  4. 2601
  5. 4761
  6. 4489
  7. 7225
  8. 2025
  9. 9409
  10. 7744
  11. 7921
  12. 2304
  13. 1024
  14. 2704
  15. 8649
  16. 5041
  17. 961
  18. 7569
  19. 1296
  20. 2116
  21. 5776
  22. 1369
  23. 5329
  24. 2209
  25. 7056
  26. 8464
  27. 4624
  28. 7396
  29. 2809
  30. 1764
  31. 1521
  32. 8281
  33. 1681
  34. 9801
  35. 9216
  36. 3249
  37. 3721
  38. 1225
  39. 1849
  40. 5625

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