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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 970 · 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. 1.86² =
  2. 2.37² =
  3. 3.56² =
  4. 4.82² =
  5. 5.65² =
  6. 6.31² =
  7. 7.41² =
  8. 8.77² =
  9. 9.76² =
  10. 10.54² =
  11. 11.42² =
  12. 12.61² =
  13. 13.88² =
  14. 14.57² =
  15. 15.62² =
  16. 16.78² =
  17. 17.81² =
  18. 18.71² =
  19. 19.66² =
  20. 20.43² =
  21. 21.52² =
  22. 22.63² =
  23. 23.92² =
  24. 24.64² =
  25. 25.97² =
  26. 26.89² =
  27. 27.32² =
  28. 28.94² =
  29. 29.45² =
  30. 30.48² =
  31. 31.73² =
  32. 32.91² =
  33. 33.46² =
  34. 34.51² =
  35. 35.55² =
  36. 36.38² =
  37. 37.87² =
  38. 38.85² =
  39. 39.59² =
  40. 40.35² =

Answer key

  1. 7396
  2. 1369
  3. 3136
  4. 6724
  5. 4225
  6. 961
  7. 1681
  8. 5929
  9. 5776
  10. 2916
  11. 1764
  12. 3721
  13. 7744
  14. 3249
  15. 3844
  16. 6084
  17. 6561
  18. 5041
  19. 4356
  20. 1849
  21. 2704
  22. 3969
  23. 8464
  24. 4096
  25. 9409
  26. 7921
  27. 1024
  28. 8836
  29. 2025
  30. 2304
  31. 5329
  32. 8281
  33. 2116
  34. 2601
  35. 3025
  36. 1444
  37. 7569
  38. 7225
  39. 3481
  40. 1225

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