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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 977 · 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. 1.33² =
  2. 2.78² =
  3. 3.88² =
  4. 4.42² =
  5. 5.82² =
  6. 6.94² =
  7. 7.91² =
  8. 8.31² =
  9. 9.63² =
  10. 10.43² =
  11. 11.41² =
  12. 12.81² =
  13. 13.75² =
  14. 14.74² =
  15. 15.66² =
  16. 16.61² =
  17. 17.35² =
  18. 18.77² =
  19. 19.46² =
  20. 20.62² =
  21. 21.65² =
  22. 22.48² =
  23. 23.95² =
  24. 24.37² =
  25. 25.84² =
  26. 26.44² =
  27. 27.51² =
  28. 28.64² =
  29. 29.56² =
  30. 30.36² =
  31. 31.99² =
  32. 32.38² =
  33. 33.32² =
  34. 34.54² =
  35. 35.93² =
  36. 36.98² =
  37. 37.39² =
  38. 38.53² =
  39. 39.68² =
  40. 40.67² =

Answer key

  1. 1089
  2. 6084
  3. 7744
  4. 1764
  5. 6724
  6. 8836
  7. 8281
  8. 961
  9. 3969
  10. 1849
  11. 1681
  12. 6561
  13. 5625
  14. 5476
  15. 4356
  16. 3721
  17. 1225
  18. 5929
  19. 2116
  20. 3844
  21. 4225
  22. 2304
  23. 9025
  24. 1369
  25. 7056
  26. 1936
  27. 2601
  28. 4096
  29. 3136
  30. 1296
  31. 9801
  32. 1444
  33. 1024
  34. 2916
  35. 8649
  36. 9604
  37. 1521
  38. 2809
  39. 4624
  40. 4489

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