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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 255 · 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. 1.91² =
  2. 2.89² =
  3. 3.81² =
  4. 4.59² =
  5. 5.35² =
  6. 6.34² =
  7. 7.93² =
  8. 8.77² =
  9. 9.79² =
  10. 10.72² =
  11. 11.39² =
  12. 12.64² =
  13. 13.99² =
  14. 14.43² =
  15. 15.48² =
  16. 16.51² =
  17. 17.61² =
  18. 18.96² =
  19. 19.95² =
  20. 20.46² =
  21. 21.62² =
  22. 22.86² =
  23. 23.69² =
  24. 24.44² =
  25. 25.54² =
  26. 26.42² =
  27. 27.75² =
  28. 28.71² =
  29. 29.37² =
  30. 30.36² =
  31. 31.58² =
  32. 32.56² =
  33. 33.41² =
  34. 34.88² =
  35. 35.31² =
  36. 36.52² =
  37. 37.49² =
  38. 38.97² =
  39. 39.87² =
  40. 40.55² =

Answer key

  1. 8281
  2. 7921
  3. 6561
  4. 3481
  5. 1225
  6. 1156
  7. 8649
  8. 5929
  9. 6241
  10. 5184
  11. 1521
  12. 4096
  13. 9801
  14. 1849
  15. 2304
  16. 2601
  17. 3721
  18. 9216
  19. 9025
  20. 2116
  21. 3844
  22. 7396
  23. 4761
  24. 1936
  25. 2916
  26. 1764
  27. 5625
  28. 5041
  29. 1369
  30. 1296
  31. 3364
  32. 3136
  33. 1681
  34. 7744
  35. 961
  36. 2704
  37. 2401
  38. 9409
  39. 7569
  40. 3025

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