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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 707 · 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. 1.56² =
  2. 2.69² =
  3. 3.76² =
  4. 4.39² =
  5. 5.47² =
  6. 6.36² =
  7. 7.53² =
  8. 8.52² =
  9. 9.38² =
  10. 10.87² =
  11. 11.41² =
  12. 12.89² =
  13. 13.65² =
  14. 14.48² =
  15. 15.33² =
  16. 16.96² =
  17. 17.62² =
  18. 18.73² =
  19. 19.86² =
  20. 20.43² =
  21. 21.97² =
  22. 22.51² =
  23. 23.68² =
  24. 24.42² =
  25. 25.66² =
  26. 26.44² =
  27. 27.49² =
  28. 28.37² =
  29. 29.98² =
  30. 30.75² =
  31. 31.54² =
  32. 32.31² =
  33. 33.78² =
  34. 34.77² =
  35. 35.61² =
  36. 36.81² =
  37. 37.94² =
  38. 38.34² =
  39. 39.46² =
  40. 40.91² =

Answer key

  1. 3136
  2. 4761
  3. 5776
  4. 1521
  5. 2209
  6. 1296
  7. 2809
  8. 2704
  9. 1444
  10. 7569
  11. 1681
  12. 7921
  13. 4225
  14. 2304
  15. 1089
  16. 9216
  17. 3844
  18. 5329
  19. 7396
  20. 1849
  21. 9409
  22. 2601
  23. 4624
  24. 1764
  25. 4356
  26. 1936
  27. 2401
  28. 1369
  29. 9604
  30. 5625
  31. 2916
  32. 961
  33. 6084
  34. 5929
  35. 3721
  36. 6561
  37. 8836
  38. 1156
  39. 2116
  40. 8281

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