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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 922 · 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. 1.68² =
  2. 2.42² =
  3. 3.83² =
  4. 4.91² =
  5. 5.34² =
  6. 6.53² =
  7. 7.65² =
  8. 8.95² =
  9. 9.96² =
  10. 10.67² =
  11. 11.33² =
  12. 12.43² =
  13. 13.71² =
  14. 14.78² =
  15. 15.61² =
  16. 16.81² =
  17. 17.47² =
  18. 18.49² =
  19. 19.69² =
  20. 20.48² =
  21. 21.89² =
  22. 22.51² =
  23. 23.45² =
  24. 24.35² =
  25. 25.63² =
  26. 26.44² =
  27. 27.46² =
  28. 28.99² =
  29. 29.85² =
  30. 30.98² =
  31. 31.37² =
  32. 32.73² =
  33. 33.88² =
  34. 34.41² =
  35. 35.52² =
  36. 36.32² =
  37. 37.87² =
  38. 38.56² =
  39. 39.92² =
  40. 40.59² =

Answer key

  1. 4624
  2. 1764
  3. 6889
  4. 8281
  5. 1156
  6. 2809
  7. 4225
  8. 9025
  9. 9216
  10. 4489
  11. 1089
  12. 1849
  13. 5041
  14. 6084
  15. 3721
  16. 6561
  17. 2209
  18. 2401
  19. 4761
  20. 2304
  21. 7921
  22. 2601
  23. 2025
  24. 1225
  25. 3969
  26. 1936
  27. 2116
  28. 9801
  29. 7225
  30. 9604
  31. 1369
  32. 5329
  33. 7744
  34. 1681
  35. 2704
  36. 1024
  37. 7569
  38. 3136
  39. 8464
  40. 3481

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