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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 328 · 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. 1.43² =
  2. 2.47² =
  3. 3.51² =
  4. 4.93² =
  5. 5.36² =
  6. 6.84² =
  7. 7.98² =
  8. 8.88² =
  9. 9.49² =
  10. 10.54² =
  11. 11.64² =
  12. 12.61² =
  13. 13.34² =
  14. 14.37² =
  15. 15.94² =
  16. 16.53² =
  17. 17.76² =
  18. 18.99² =
  19. 19.58² =
  20. 20.75² =
  21. 21.62² =
  22. 22.74² =
  23. 23.72² =
  24. 24.41² =
  25. 25.52² =
  26. 26.46² =
  27. 27.68² =
  28. 28.38² =
  29. 29.31² =
  30. 30.44² =
  31. 31.77² =
  32. 32.42² =
  33. 33.92² =
  34. 34.97² =
  35. 35.91² =
  36. 36.32² =
  37. 37.81² =
  38. 38.89² =
  39. 39.56² =
  40. 40.82² =

Answer key

  1. 1849
  2. 2209
  3. 2601
  4. 8649
  5. 1296
  6. 7056
  7. 9604
  8. 7744
  9. 2401
  10. 2916
  11. 4096
  12. 3721
  13. 1156
  14. 1369
  15. 8836
  16. 2809
  17. 5776
  18. 9801
  19. 3364
  20. 5625
  21. 3844
  22. 5476
  23. 5184
  24. 1681
  25. 2704
  26. 2116
  27. 4624
  28. 1444
  29. 961
  30. 1936
  31. 5929
  32. 1764
  33. 8464
  34. 9409
  35. 8281
  36. 1024
  37. 6561
  38. 7921
  39. 3136
  40. 6724

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