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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 927 · 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. 1.61² =
  2. 2.53² =
  3. 3.89² =
  4. 4.36² =
  5. 5.91² =
  6. 6.32² =
  7. 7.62² =
  8. 8.71² =
  9. 9.68² =
  10. 10.49² =
  11. 11.41² =
  12. 12.34² =
  13. 13.75² =
  14. 14.47² =
  15. 15.37² =
  16. 16.46² =
  17. 17.99² =
  18. 18.67² =
  19. 19.77² =
  20. 20.51² =
  21. 21.81² =
  22. 22.55² =
  23. 23.78² =
  24. 24.59² =
  25. 25.87² =
  26. 26.35² =
  27. 27.39² =
  28. 28.42² =
  29. 29.63² =
  30. 30.74² =
  31. 31.84² =
  32. 32.44² =
  33. 33.38² =
  34. 34.31² =
  35. 35.85² =
  36. 36.95² =
  37. 37.69² =
  38. 38.92² =
  39. 39.43² =
  40. 40.48² =

Answer key

  1. 3721
  2. 2809
  3. 7921
  4. 1296
  5. 8281
  6. 1024
  7. 3844
  8. 5041
  9. 4624
  10. 2401
  11. 1681
  12. 1156
  13. 5625
  14. 2209
  15. 1369
  16. 2116
  17. 9801
  18. 4489
  19. 5929
  20. 2601
  21. 6561
  22. 3025
  23. 6084
  24. 3481
  25. 7569
  26. 1225
  27. 1521
  28. 1764
  29. 3969
  30. 5476
  31. 7056
  32. 1936
  33. 1444
  34. 961
  35. 7225
  36. 9025
  37. 4761
  38. 8464
  39. 1849
  40. 2304

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