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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 915 · 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. 1.54² =
  2. 2.43² =
  3. 3.41² =
  4. 4.53² =
  5. 5.69² =
  6. 6.52² =
  7. 7.57² =
  8. 8.31² =
  9. 9.86² =
  10. 10.65² =
  11. 11.34² =
  12. 12.71² =
  13. 13.49² =
  14. 14.99² =
  15. 15.91² =
  16. 16.61² =
  17. 17.63² =
  18. 18.67² =
  19. 19.37² =
  20. 20.92² =
  21. 21.51² =
  22. 22.48² =
  23. 23.75² =
  24. 24.83² =
  25. 25.42² =
  26. 26.79² =
  27. 27.68² =
  28. 28.96² =
  29. 29.77² =
  30. 30.59² =
  31. 31.36² =
  32. 32.74² =
  33. 33.81² =
  34. 34.82² =
  35. 35.44² =
  36. 36.66² =
  37. 37.87² =
  38. 38.85² =
  39. 39.95² =
  40. 40.38² =

Answer key

  1. 2916
  2. 1849
  3. 1681
  4. 2809
  5. 4761
  6. 2704
  7. 3249
  8. 961
  9. 7396
  10. 4225
  11. 1156
  12. 5041
  13. 2401
  14. 9801
  15. 8281
  16. 3721
  17. 3969
  18. 4489
  19. 1369
  20. 8464
  21. 2601
  22. 2304
  23. 5625
  24. 6889
  25. 1764
  26. 6241
  27. 4624
  28. 9216
  29. 5929
  30. 3481
  31. 1296
  32. 5476
  33. 6561
  34. 6724
  35. 1936
  36. 4356
  37. 7569
  38. 7225
  39. 9025
  40. 1444

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