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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 487 · 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. 1.51² =
  2. 2.77² =
  3. 3.63² =
  4. 4.99² =
  5. 5.78² =
  6. 6.62² =
  7. 7.82² =
  8. 8.57² =
  9. 9.84² =
  10. 10.81² =
  11. 11.96² =
  12. 12.45² =
  13. 13.95² =
  14. 14.54² =
  15. 15.56² =
  16. 16.39² =
  17. 17.85² =
  18. 18.36² =
  19. 19.74² =
  20. 20.68² =
  21. 21.55² =
  22. 22.48² =
  23. 23.42² =
  24. 24.64² =
  25. 25.43² =
  26. 26.44² =
  27. 27.58² =
  28. 28.38² =
  29. 29.32² =
  30. 30.37² =
  31. 31.72² =
  32. 32.71² =
  33. 33.31² =
  34. 34.76² =
  35. 35.69² =
  36. 36.91² =
  37. 37.35² =
  38. 38.46² =
  39. 39.89² =
  40. 40.41² =

Answer key

  1. 2601
  2. 5929
  3. 3969
  4. 9801
  5. 6084
  6. 3844
  7. 6724
  8. 3249
  9. 7056
  10. 6561
  11. 9216
  12. 2025
  13. 9025
  14. 2916
  15. 3136
  16. 1521
  17. 7225
  18. 1296
  19. 5476
  20. 4624
  21. 3025
  22. 2304
  23. 1764
  24. 4096
  25. 1849
  26. 1936
  27. 3364
  28. 1444
  29. 1024
  30. 1369
  31. 5184
  32. 5041
  33. 961
  34. 5776
  35. 4761
  36. 8281
  37. 1225
  38. 2116
  39. 7921
  40. 1681

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