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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 409 · 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. 1.41² =
  2. 2.87² =
  3. 3.63² =
  4. 4.99² =
  5. 5.78² =
  6. 6.76² =
  7. 7.81² =
  8. 8.92² =
  9. 9.47² =
  10. 10.31² =
  11. 11.55² =
  12. 12.95² =
  13. 13.49² =
  14. 14.54² =
  15. 15.67² =
  16. 16.72² =
  17. 17.77² =
  18. 18.34² =
  19. 19.46² =
  20. 20.94² =
  21. 21.44² =
  22. 22.57² =
  23. 23.38² =
  24. 24.69² =
  25. 25.35² =
  26. 26.88² =
  27. 27.51² =
  28. 28.96² =
  29. 29.97² =
  30. 30.66² =
  31. 31.59² =
  32. 32.36² =
  33. 33.61² =
  34. 34.83² =
  35. 35.75² =
  36. 36.91² =
  37. 37.62² =
  38. 38.43² =
  39. 39.79² =
  40. 40.64² =

Answer key

  1. 1681
  2. 7569
  3. 3969
  4. 9801
  5. 6084
  6. 5776
  7. 6561
  8. 8464
  9. 2209
  10. 961
  11. 3025
  12. 9025
  13. 2401
  14. 2916
  15. 4489
  16. 5184
  17. 5929
  18. 1156
  19. 2116
  20. 8836
  21. 1936
  22. 3249
  23. 1444
  24. 4761
  25. 1225
  26. 7744
  27. 2601
  28. 9216
  29. 9409
  30. 4356
  31. 3481
  32. 1296
  33. 3721
  34. 6889
  35. 5625
  36. 8281
  37. 3844
  38. 1849
  39. 6241
  40. 4096

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