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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 573 · 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. 2.62² =
  3. 3.48² =
  4. 4.31² =
  5. 5.69² =
  6. 6.68² =
  7. 7.38² =
  8. 8.55² =
  9. 9.51² =
  10. 10.45² =
  11. 11.82² =
  12. 12.43² =
  13. 13.59² =
  14. 14.58² =
  15. 15.75² =
  16. 16.36² =
  17. 17.99² =
  18. 18.52² =
  19. 19.37² =
  20. 20.33² =
  21. 21.73² =
  22. 22.35² =
  23. 23.53² =
  24. 24.97² =
  25. 25.96² =
  26. 26.56² =
  27. 27.77² =
  28. 28.72² =
  29. 29.46² =
  30. 30.64² =
  31. 31.54² =
  32. 32.44² =
  33. 33.86² =
  34. 34.81² =
  35. 35.93² =
  36. 36.83² =
  37. 37.87² =
  38. 38.95² =
  39. 39.71² =
  40. 40.32² =

Answer key

  1. 1681
  2. 3844
  3. 2304
  4. 961
  5. 4761
  6. 4624
  7. 1444
  8. 3025
  9. 2601
  10. 2025
  11. 6724
  12. 1849
  13. 3481
  14. 3364
  15. 5625
  16. 1296
  17. 9801
  18. 2704
  19. 1369
  20. 1089
  21. 5329
  22. 1225
  23. 2809
  24. 9409
  25. 9216
  26. 3136
  27. 5929
  28. 5184
  29. 2116
  30. 4096
  31. 2916
  32. 1936
  33. 7396
  34. 6561
  35. 8649
  36. 6889
  37. 7569
  38. 9025
  39. 5041
  40. 1024

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