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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 984 · 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. 1.97² =
  2. 2.51² =
  3. 3.56² =
  4. 4.66² =
  5. 5.95² =
  6. 6.77² =
  7. 7.85² =
  8. 8.32² =
  9. 9.93² =
  10. 10.55² =
  11. 11.61² =
  12. 12.89² =
  13. 13.43² =
  14. 14.54² =
  15. 15.39² =
  16. 16.98² =
  17. 17.41² =
  18. 18.38² =
  19. 19.46² =
  20. 20.83² =
  21. 21.64² =
  22. 22.92² =
  23. 23.69² =
  24. 24.58² =
  25. 25.96² =
  26. 26.71² =
  27. 27.35² =
  28. 28.65² =
  29. 29.76² =
  30. 30.81² =
  31. 31.44² =
  32. 32.94² =
  33. 33.68² =
  34. 34.42² =
  35. 35.75² =
  36. 36.86² =
  37. 37.52² =
  38. 38.99² =
  39. 39.62² =
  40. 40.67² =

Answer key

  1. 9409
  2. 2601
  3. 3136
  4. 4356
  5. 9025
  6. 5929
  7. 7225
  8. 1024
  9. 8649
  10. 3025
  11. 3721
  12. 7921
  13. 1849
  14. 2916
  15. 1521
  16. 9604
  17. 1681
  18. 1444
  19. 2116
  20. 6889
  21. 4096
  22. 8464
  23. 4761
  24. 3364
  25. 9216
  26. 5041
  27. 1225
  28. 4225
  29. 5776
  30. 6561
  31. 1936
  32. 8836
  33. 4624
  34. 1764
  35. 5625
  36. 7396
  37. 2704
  38. 9801
  39. 3844
  40. 4489

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