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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 130 · 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. 1.67² =
  2. 2.53² =
  3. 3.58² =
  4. 4.34² =
  5. 5.82² =
  6. 6.77² =
  7. 7.95² =
  8. 8.74² =
  9. 9.96² =
  10. 10.71² =
  11. 11.38² =
  12. 12.33² =
  13. 13.61² =
  14. 14.44² =
  15. 15.79² =
  16. 16.41² =
  17. 17.31² =
  18. 18.42² =
  19. 19.35² =
  20. 20.68² =
  21. 21.56² =
  22. 22.92² =
  23. 23.39² =
  24. 24.51² =
  25. 25.59² =
  26. 26.43² =
  27. 27.81² =
  28. 28.54² =
  29. 29.91² =
  30. 30.83² =
  31. 31.49² =
  32. 32.46² =
  33. 33.87² =
  34. 34.45² =
  35. 35.66² =
  36. 36.55² =
  37. 37.75² =
  38. 38.76² =
  39. 39.72² =
  40. 40.86² =

Answer key

  1. 4489
  2. 2809
  3. 3364
  4. 1156
  5. 6724
  6. 5929
  7. 9025
  8. 5476
  9. 9216
  10. 5041
  11. 1444
  12. 1089
  13. 3721
  14. 1936
  15. 6241
  16. 1681
  17. 961
  18. 1764
  19. 1225
  20. 4624
  21. 3136
  22. 8464
  23. 1521
  24. 2601
  25. 3481
  26. 1849
  27. 6561
  28. 2916
  29. 8281
  30. 6889
  31. 2401
  32. 2116
  33. 7569
  34. 2025
  35. 4356
  36. 3025
  37. 5625
  38. 5776
  39. 5184
  40. 7396

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