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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 898 · 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. 1.65² =
  2. 2.72² =
  3. 3.78² =
  4. 4.81² =
  5. 5.76² =
  6. 6.83² =
  7. 7.38² =
  8. 8.66² =
  9. 9.61² =
  10. 10.98² =
  11. 11.41² =
  12. 12.35² =
  13. 13.68² =
  14. 14.63² =
  15. 15.82² =
  16. 16.39² =
  17. 17.77² =
  18. 18.34² =
  19. 19.94² =
  20. 20.49² =
  21. 21.36² =
  22. 22.64² =
  23. 23.37² =
  24. 24.96² =
  25. 25.91² =
  26. 26.44² =
  27. 27.67² =
  28. 28.84² =
  29. 29.93² =
  30. 30.58² =
  31. 31.33² =
  32. 32.53² =
  33. 33.55² =
  34. 34.87² =
  35. 35.32² =
  36. 36.97² =
  37. 37.89² =
  38. 38.54² =
  39. 39.88² =
  40. 40.57² =

Answer key

  1. 4225
  2. 5184
  3. 6084
  4. 6561
  5. 5776
  6. 6889
  7. 1444
  8. 4356
  9. 3721
  10. 9604
  11. 1681
  12. 1225
  13. 4624
  14. 3969
  15. 6724
  16. 1521
  17. 5929
  18. 1156
  19. 8836
  20. 2401
  21. 1296
  22. 4096
  23. 1369
  24. 9216
  25. 8281
  26. 1936
  27. 4489
  28. 7056
  29. 8649
  30. 3364
  31. 1089
  32. 2809
  33. 3025
  34. 7569
  35. 1024
  36. 9409
  37. 7921
  38. 2916
  39. 7744
  40. 3249

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