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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 933 · 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. 1.68² =
  2. 2.39² =
  3. 3.33² =
  4. 4.51² =
  5. 5.91² =
  6. 6.31² =
  7. 7.74² =
  8. 8.78² =
  9. 9.52² =
  10. 10.41² =
  11. 11.58² =
  12. 12.76² =
  13. 13.88² =
  14. 14.86² =
  15. 15.96² =
  16. 16.73² =
  17. 17.36² =
  18. 18.53² =
  19. 19.42² =
  20. 20.94² =
  21. 21.44² =
  22. 22.71² =
  23. 23.63² =
  24. 24.56² =
  25. 25.62² =
  26. 26.34² =
  27. 27.82² =
  28. 28.64² =
  29. 29.89² =
  30. 30.47² =
  31. 31.69² =
  32. 32.57² =
  33. 33.43² =
  34. 34.38² =
  35. 35.81² =
  36. 36.95² =
  37. 37.61² =
  38. 38.66² =
  39. 39.54² =
  40. 40.92² =

Answer key

  1. 4624
  2. 1521
  3. 1089
  4. 2601
  5. 8281
  6. 961
  7. 5476
  8. 6084
  9. 2704
  10. 1681
  11. 3364
  12. 5776
  13. 7744
  14. 7396
  15. 9216
  16. 5329
  17. 1296
  18. 2809
  19. 1764
  20. 8836
  21. 1936
  22. 5041
  23. 3969
  24. 3136
  25. 3844
  26. 1156
  27. 6724
  28. 4096
  29. 7921
  30. 2209
  31. 4761
  32. 3249
  33. 1849
  34. 1444
  35. 6561
  36. 9025
  37. 3721
  38. 4356
  39. 2916
  40. 8464

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