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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 937 · 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. 1.67² =
  2. 2.54² =
  3. 3.62² =
  4. 4.91² =
  5. 5.79² =
  6. 6.61² =
  7. 7.73² =
  8. 8.81² =
  9. 9.88² =
  10. 10.69² =
  11. 11.77² =
  12. 12.64² =
  13. 13.98² =
  14. 14.37² =
  15. 15.89² =
  16. 16.35² =
  17. 17.86² =
  18. 18.55² =
  19. 19.71² =
  20. 20.97² =
  21. 21.47² =
  22. 22.99² =
  23. 23.36² =
  24. 24.49² =
  25. 25.31² =
  26. 26.53² =
  27. 27.84² =
  28. 28.41² =
  29. 29.45² =
  30. 30.42² =
  31. 31.95² =
  32. 32.93² =
  33. 33.96² =
  34. 34.51² =
  35. 35.92² =
  36. 36.46² =
  37. 37.85² =
  38. 38.39² =
  39. 39.52² =
  40. 40.57² =

Answer key

  1. 4489
  2. 2916
  3. 3844
  4. 8281
  5. 6241
  6. 3721
  7. 5329
  8. 6561
  9. 7744
  10. 4761
  11. 5929
  12. 4096
  13. 9604
  14. 1369
  15. 7921
  16. 1225
  17. 7396
  18. 3025
  19. 5041
  20. 9409
  21. 2209
  22. 9801
  23. 1296
  24. 2401
  25. 961
  26. 2809
  27. 7056
  28. 1681
  29. 2025
  30. 1764
  31. 9025
  32. 8649
  33. 9216
  34. 2601
  35. 8464
  36. 2116
  37. 7225
  38. 1521
  39. 2704
  40. 3249

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