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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 506 · 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. 1.83² =
  2. 2.55² =
  3. 3.41² =
  4. 4.61² =
  5. 5.71² =
  6. 6.96² =
  7. 7.62² =
  8. 8.43² =
  9. 9.53² =
  10. 10.91² =
  11. 11.94² =
  12. 12.34² =
  13. 13.56² =
  14. 14.37² =
  15. 15.57² =
  16. 16.39² =
  17. 17.52² =
  18. 18.54² =
  19. 19.82² =
  20. 20.69² =
  21. 21.99² =
  22. 22.32² =
  23. 23.68² =
  24. 24.33² =
  25. 25.63² =
  26. 26.73² =
  27. 27.86² =
  28. 28.31² =
  29. 29.35² =
  30. 30.51² =
  31. 31.74² =
  32. 32.48² =
  33. 33.49² =
  34. 34.97² =
  35. 35.72² =
  36. 36.81² =
  37. 37.38² =
  38. 38.87² =
  39. 39.75² =
  40. 40.44² =

Answer key

  1. 6889
  2. 3025
  3. 1681
  4. 3721
  5. 5041
  6. 9216
  7. 3844
  8. 1849
  9. 2809
  10. 8281
  11. 8836
  12. 1156
  13. 3136
  14. 1369
  15. 3249
  16. 1521
  17. 2704
  18. 2916
  19. 6724
  20. 4761
  21. 9801
  22. 1024
  23. 4624
  24. 1089
  25. 3969
  26. 5329
  27. 7396
  28. 961
  29. 1225
  30. 2601
  31. 5476
  32. 2304
  33. 2401
  34. 9409
  35. 5184
  36. 6561
  37. 1444
  38. 7569
  39. 5625
  40. 1936

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