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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 789 · 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. 1.88² =
  2. 2.47² =
  3. 3.51² =
  4. 4.65² =
  5. 5.94² =
  6. 6.41² =
  7. 7.38² =
  8. 8.84² =
  9. 9.97² =
  10. 10.71² =
  11. 11.98² =
  12. 12.76² =
  13. 13.99² =
  14. 14.85² =
  15. 15.86² =
  16. 16.64² =
  17. 17.52² =
  18. 18.81² =
  19. 19.58² =
  20. 20.77² =
  21. 21.67² =
  22. 22.54² =
  23. 23.33² =
  24. 24.31² =
  25. 25.49² =
  26. 26.35² =
  27. 27.36² =
  28. 28.34² =
  29. 29.89² =
  30. 30.68² =
  31. 31.75² =
  32. 32.62² =
  33. 33.55² =
  34. 34.82² =
  35. 35.45² =
  36. 36.78² =
  37. 37.42² =
  38. 38.32² =
  39. 39.61² =
  40. 40.95² =

Answer key

  1. 7744
  2. 2209
  3. 2601
  4. 4225
  5. 8836
  6. 1681
  7. 1444
  8. 7056
  9. 9409
  10. 5041
  11. 9604
  12. 5776
  13. 9801
  14. 7225
  15. 7396
  16. 4096
  17. 2704
  18. 6561
  19. 3364
  20. 5929
  21. 4489
  22. 2916
  23. 1089
  24. 961
  25. 2401
  26. 1225
  27. 1296
  28. 1156
  29. 7921
  30. 4624
  31. 5625
  32. 3844
  33. 3025
  34. 6724
  35. 2025
  36. 6084
  37. 1764
  38. 1024
  39. 3721
  40. 9025

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