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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 868 · 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. 1.85² =
  2. 2.99² =
  3. 3.64² =
  4. 4.81² =
  5. 5.32² =
  6. 6.34² =
  7. 7.77² =
  8. 8.35² =
  9. 9.94² =
  10. 10.67² =
  11. 11.78² =
  12. 12.88² =
  13. 13.86² =
  14. 14.36² =
  15. 15.93² =
  16. 16.59² =
  17. 17.97² =
  18. 18.55² =
  19. 19.46² =
  20. 20.41² =
  21. 21.75² =
  22. 22.45² =
  23. 23.84² =
  24. 24.38² =
  25. 25.62² =
  26. 26.49² =
  27. 27.33² =
  28. 28.71² =
  29. 29.92² =
  30. 30.74² =
  31. 31.79² =
  32. 32.83² =
  33. 33.51² =
  34. 34.89² =
  35. 35.44² =
  36. 36.65² =
  37. 37.72² =
  38. 38.47² =
  39. 39.43² =
  40. 40.82² =

Answer key

  1. 7225
  2. 9801
  3. 4096
  4. 6561
  5. 1024
  6. 1156
  7. 5929
  8. 1225
  9. 8836
  10. 4489
  11. 6084
  12. 7744
  13. 7396
  14. 1296
  15. 8649
  16. 3481
  17. 9409
  18. 3025
  19. 2116
  20. 1681
  21. 5625
  22. 2025
  23. 7056
  24. 1444
  25. 3844
  26. 2401
  27. 1089
  28. 5041
  29. 8464
  30. 5476
  31. 6241
  32. 6889
  33. 2601
  34. 7921
  35. 1936
  36. 4225
  37. 5184
  38. 2209
  39. 1849
  40. 6724

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