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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 849 · 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. 1.45² =
  2. 2.82² =
  3. 3.41² =
  4. 4.46² =
  5. 5.53² =
  6. 6.67² =
  7. 7.44² =
  8. 8.36² =
  9. 9.78² =
  10. 10.72² =
  11. 11.91² =
  12. 12.86² =
  13. 13.56² =
  14. 14.35² =
  15. 15.81² =
  16. 16.97² =
  17. 17.48² =
  18. 18.95² =
  19. 19.33² =
  20. 20.92² =
  21. 21.34² =
  22. 22.42² =
  23. 23.49² =
  24. 24.94² =
  25. 25.79² =
  26. 26.55² =
  27. 27.93² =
  28. 28.75² =
  29. 29.51² =
  30. 30.77² =
  31. 31.57² =
  32. 32.38² =
  33. 33.47² =
  34. 34.71² =
  35. 35.54² =
  36. 36.68² =
  37. 37.99² =
  38. 38.43² =
  39. 39.62² =
  40. 40.89² =

Answer key

  1. 2025
  2. 6724
  3. 1681
  4. 2116
  5. 2809
  6. 4489
  7. 1936
  8. 1296
  9. 6084
  10. 5184
  11. 8281
  12. 7396
  13. 3136
  14. 1225
  15. 6561
  16. 9409
  17. 2304
  18. 9025
  19. 1089
  20. 8464
  21. 1156
  22. 1764
  23. 2401
  24. 8836
  25. 6241
  26. 3025
  27. 8649
  28. 5625
  29. 2601
  30. 5929
  31. 3249
  32. 1444
  33. 2209
  34. 5041
  35. 2916
  36. 4624
  37. 9801
  38. 1849
  39. 3844
  40. 7921

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