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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 950 · 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. 1.64² =
  2. 2.98² =
  3. 3.51² =
  4. 4.61² =
  5. 5.89² =
  6. 6.83² =
  7. 7.54² =
  8. 8.81² =
  9. 9.82² =
  10. 10.57² =
  11. 11.31² =
  12. 12.36² =
  13. 13.88² =
  14. 14.79² =
  15. 15.53² =
  16. 16.45² =
  17. 17.33² =
  18. 18.72² =
  19. 19.58² =
  20. 20.41² =
  21. 21.92² =
  22. 22.78² =
  23. 23.39² =
  24. 24.85² =
  25. 25.86² =
  26. 26.56² =
  27. 27.34² =
  28. 28.62² =
  29. 29.32² =
  30. 30.93² =
  31. 31.35² =
  32. 32.77² =
  33. 33.95² =
  34. 34.91² =
  35. 35.96² =
  36. 36.99² =
  37. 37.71² =
  38. 38.74² =
  39. 39.46² =
  40. 40.69² =

Answer key

  1. 4096
  2. 9604
  3. 2601
  4. 3721
  5. 7921
  6. 6889
  7. 2916
  8. 6561
  9. 6724
  10. 3249
  11. 961
  12. 1296
  13. 7744
  14. 6241
  15. 2809
  16. 2025
  17. 1089
  18. 5184
  19. 3364
  20. 1681
  21. 8464
  22. 6084
  23. 1521
  24. 7225
  25. 7396
  26. 3136
  27. 1156
  28. 3844
  29. 1024
  30. 8649
  31. 1225
  32. 5929
  33. 9025
  34. 8281
  35. 9216
  36. 9801
  37. 5041
  38. 5476
  39. 2116
  40. 4761

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