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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 990 · 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. 1.41² =
  2. 2.91² =
  3. 3.99² =
  4. 4.89² =
  5. 5.54² =
  6. 6.61² =
  7. 7.38² =
  8. 8.59² =
  9. 9.49² =
  10. 10.81² =
  11. 11.79² =
  12. 12.34² =
  13. 13.45² =
  14. 14.36² =
  15. 15.95² =
  16. 16.69² =
  17. 17.33² =
  18. 18.82² =
  19. 19.93² =
  20. 20.31² =
  21. 21.68² =
  22. 22.94² =
  23. 23.78² =
  24. 24.52² =
  25. 25.77² =
  26. 26.76² =
  27. 27.42² =
  28. 28.58² =
  29. 29.71² =
  30. 30.63² =
  31. 31.37² =
  32. 32.47² =
  33. 33.88² =
  34. 34.62² =
  35. 35.75² =
  36. 36.56² =
  37. 37.83² =
  38. 38.48² =
  39. 39.51² =
  40. 40.43² =

Answer key

  1. 1681
  2. 8281
  3. 9801
  4. 7921
  5. 2916
  6. 3721
  7. 1444
  8. 3481
  9. 2401
  10. 6561
  11. 6241
  12. 1156
  13. 2025
  14. 1296
  15. 9025
  16. 4761
  17. 1089
  18. 6724
  19. 8649
  20. 961
  21. 4624
  22. 8836
  23. 6084
  24. 2704
  25. 5929
  26. 5776
  27. 1764
  28. 3364
  29. 5041
  30. 3969
  31. 1369
  32. 2209
  33. 7744
  34. 3844
  35. 5625
  36. 3136
  37. 6889
  38. 2304
  39. 2601
  40. 1849

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