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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 172 · 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. 1.35² =
  2. 2.81² =
  3. 3.99² =
  4. 4.61² =
  5. 5.94² =
  6. 6.32² =
  7. 7.75² =
  8. 8.33² =
  9. 9.47² =
  10. 10.67² =
  11. 11.45² =
  12. 12.62² =
  13. 13.46² =
  14. 14.86² =
  15. 15.79² =
  16. 16.48² =
  17. 17.52² =
  18. 18.91² =
  19. 19.42² =
  20. 20.44² =
  21. 21.83² =
  22. 22.71² =
  23. 23.63² =
  24. 24.69² =
  25. 25.93² =
  26. 26.59² =
  27. 27.89² =
  28. 28.68² =
  29. 29.43² =
  30. 30.51² =
  31. 31.92² =
  32. 32.54² =
  33. 33.41² =
  34. 34.37² =
  35. 35.88² =
  36. 36.84² =
  37. 37.34² =
  38. 38.38² =
  39. 39.56² =
  40. 40.49² =

Answer key

  1. 1225
  2. 6561
  3. 9801
  4. 3721
  5. 8836
  6. 1024
  7. 5625
  8. 1089
  9. 2209
  10. 4489
  11. 2025
  12. 3844
  13. 2116
  14. 7396
  15. 6241
  16. 2304
  17. 2704
  18. 8281
  19. 1764
  20. 1936
  21. 6889
  22. 5041
  23. 3969
  24. 4761
  25. 8649
  26. 3481
  27. 7921
  28. 4624
  29. 1849
  30. 2601
  31. 8464
  32. 2916
  33. 1681
  34. 1369
  35. 7744
  36. 7056
  37. 1156
  38. 1444
  39. 3136
  40. 2401

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