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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 880 · 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. 1.43² =
  2. 2.78² =
  3. 3.46² =
  4. 4.63² =
  5. 5.41² =
  6. 6.84² =
  7. 7.44² =
  8. 8.82² =
  9. 9.86² =
  10. 10.81² =
  11. 11.75² =
  12. 12.67² =
  13. 13.77² =
  14. 14.87² =
  15. 15.55² =
  16. 16.76² =
  17. 17.58² =
  18. 18.66² =
  19. 19.38² =
  20. 20.97² =
  21. 21.73² =
  22. 22.96² =
  23. 23.98² =
  24. 24.31² =
  25. 25.74² =
  26. 26.33² =
  27. 27.54² =
  28. 28.51² =
  29. 29.88² =
  30. 30.61² =
  31. 31.91² =
  32. 32.69² =
  33. 33.93² =
  34. 34.83² =
  35. 35.36² =
  36. 36.37² =
  37. 37.99² =
  38. 38.47² =
  39. 39.62² =
  40. 40.92² =

Answer key

  1. 1849
  2. 6084
  3. 2116
  4. 3969
  5. 1681
  6. 7056
  7. 1936
  8. 6724
  9. 7396
  10. 6561
  11. 5625
  12. 4489
  13. 5929
  14. 7569
  15. 3025
  16. 5776
  17. 3364
  18. 4356
  19. 1444
  20. 9409
  21. 5329
  22. 9216
  23. 9604
  24. 961
  25. 5476
  26. 1089
  27. 2916
  28. 2601
  29. 7744
  30. 3721
  31. 8281
  32. 4761
  33. 8649
  34. 6889
  35. 1296
  36. 1369
  37. 9801
  38. 2209
  39. 3844
  40. 8464

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