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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 997 · 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. 1.41² =
  2. 2.99² =
  3. 3.67² =
  4. 4.95² =
  5. 5.62² =
  6. 6.42² =
  7. 7.57² =
  8. 8.64² =
  9. 9.93² =
  10. 10.49² =
  11. 11.32² =
  12. 12.82² =
  13. 13.33² =
  14. 14.77² =
  15. 15.88² =
  16. 16.48² =
  17. 17.38² =
  18. 18.83² =
  19. 19.73² =
  20. 20.54² =
  21. 21.78² =
  22. 22.51² =
  23. 23.46² =
  24. 24.97² =
  25. 25.36² =
  26. 26.61² =
  27. 27.68² =
  28. 28.91² =
  29. 29.55² =
  30. 30.35² =
  31. 31.74² =
  32. 32.76² =
  33. 33.39² =
  34. 34.56² =
  35. 35.85² =
  36. 36.58² =
  37. 37.75² =
  38. 38.47² =
  39. 39.53² =
  40. 40.37² =

Answer key

  1. 1681
  2. 9801
  3. 4489
  4. 9025
  5. 3844
  6. 1764
  7. 3249
  8. 4096
  9. 8649
  10. 2401
  11. 1024
  12. 6724
  13. 1089
  14. 5929
  15. 7744
  16. 2304
  17. 1444
  18. 6889
  19. 5329
  20. 2916
  21. 6084
  22. 2601
  23. 2116
  24. 9409
  25. 1296
  26. 3721
  27. 4624
  28. 8281
  29. 3025
  30. 1225
  31. 5476
  32. 5776
  33. 1521
  34. 3136
  35. 7225
  36. 3364
  37. 5625
  38. 2209
  39. 2809
  40. 1369

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