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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 788 · 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. 1.73² =
  2. 2.36² =
  3. 3.53² =
  4. 4.35² =
  5. 5.47² =
  6. 6.68² =
  7. 7.46² =
  8. 8.64² =
  9. 9.39² =
  10. 10.48² =
  11. 11.57² =
  12. 12.43² =
  13. 13.62² =
  14. 14.52² =
  15. 15.71² =
  16. 16.76² =
  17. 17.87² =
  18. 18.77² =
  19. 19.41² =
  20. 20.37² =
  21. 21.42² =
  22. 22.95² =
  23. 23.81² =
  24. 24.79² =
  25. 25.66² =
  26. 26.96² =
  27. 27.38² =
  28. 28.83² =
  29. 29.78² =
  30. 30.31² =
  31. 31.34² =
  32. 32.99² =
  33. 33.86² =
  34. 34.33² =
  35. 35.45² =
  36. 36.51² =
  37. 37.56² =
  38. 38.59² =
  39. 39.75² =
  40. 40.54² =

Answer key

  1. 5329
  2. 1296
  3. 2809
  4. 1225
  5. 2209
  6. 4624
  7. 2116
  8. 4096
  9. 1521
  10. 2304
  11. 3249
  12. 1849
  13. 3844
  14. 2704
  15. 5041
  16. 5776
  17. 7569
  18. 5929
  19. 1681
  20. 1369
  21. 1764
  22. 9025
  23. 6561
  24. 6241
  25. 4356
  26. 9216
  27. 1444
  28. 6889
  29. 6084
  30. 961
  31. 1156
  32. 9801
  33. 7396
  34. 1089
  35. 2025
  36. 2601
  37. 3136
  38. 3481
  39. 5625
  40. 2916

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