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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 892 · 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. 1.77² =
  2. 2.41² =
  3. 3.47² =
  4. 4.78² =
  5. 5.85² =
  6. 6.52² =
  7. 7.44² =
  8. 8.91² =
  9. 9.69² =
  10. 10.45² =
  11. 11.75² =
  12. 12.62² =
  13. 13.58² =
  14. 14.56² =
  15. 15.74² =
  16. 16.98² =
  17. 17.97² =
  18. 18.54² =
  19. 19.66² =
  20. 20.92² =
  21. 21.81² =
  22. 22.35² =
  23. 23.36² =
  24. 24.99² =
  25. 25.95² =
  26. 26.88² =
  27. 27.64² =
  28. 28.86² =
  29. 29.38² =
  30. 30.31² =
  31. 31.34² =
  32. 32.33² =
  33. 33.93² =
  34. 34.42² =
  35. 35.72² =
  36. 36.37² =
  37. 37.32² =
  38. 38.51² =
  39. 39.87² =
  40. 40.84² =

Answer key

  1. 5929
  2. 1681
  3. 2209
  4. 6084
  5. 7225
  6. 2704
  7. 1936
  8. 8281
  9. 4761
  10. 2025
  11. 5625
  12. 3844
  13. 3364
  14. 3136
  15. 5476
  16. 9604
  17. 9409
  18. 2916
  19. 4356
  20. 8464
  21. 6561
  22. 1225
  23. 1296
  24. 9801
  25. 9025
  26. 7744
  27. 4096
  28. 7396
  29. 1444
  30. 961
  31. 1156
  32. 1089
  33. 8649
  34. 1764
  35. 5184
  36. 1369
  37. 1024
  38. 2601
  39. 7569
  40. 7056

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