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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 850 · 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. 1.98² =
  2. 2.78² =
  3. 3.83² =
  4. 4.34² =
  5. 5.87² =
  6. 6.39² =
  7. 7.84² =
  8. 8.42² =
  9. 9.43² =
  10. 10.59² =
  11. 11.57² =
  12. 12.41² =
  13. 13.73² =
  14. 14.49² =
  15. 15.95² =
  16. 16.52² =
  17. 17.76² =
  18. 18.88² =
  19. 19.53² =
  20. 20.74² =
  21. 21.54² =
  22. 22.64² =
  23. 23.66² =
  24. 24.55² =
  25. 25.36² =
  26. 26.56² =
  27. 27.61² =
  28. 28.72² =
  29. 29.81² =
  30. 30.91² =
  31. 31.32² =
  32. 32.71² =
  33. 33.63² =
  34. 34.48² =
  35. 35.46² =
  36. 36.38² =
  37. 37.65² =
  38. 38.77² =
  39. 39.96² =
  40. 40.44² =

Answer key

  1. 9604
  2. 6084
  3. 6889
  4. 1156
  5. 7569
  6. 1521
  7. 7056
  8. 1764
  9. 1849
  10. 3481
  11. 3249
  12. 1681
  13. 5329
  14. 2401
  15. 9025
  16. 2704
  17. 5776
  18. 7744
  19. 2809
  20. 5476
  21. 2916
  22. 4096
  23. 4356
  24. 3025
  25. 1296
  26. 3136
  27. 3721
  28. 5184
  29. 6561
  30. 8281
  31. 1024
  32. 5041
  33. 3969
  34. 2304
  35. 2116
  36. 1444
  37. 4225
  38. 5929
  39. 9216
  40. 1936

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