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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 678 · 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. 1.98² =
  2. 2.44² =
  3. 3.46² =
  4. 4.68² =
  5. 5.49² =
  6. 6.94² =
  7. 7.77² =
  8. 8.52² =
  9. 9.83² =
  10. 10.93² =
  11. 11.37² =
  12. 12.95² =
  13. 13.58² =
  14. 14.55² =
  15. 15.88² =
  16. 16.63² =
  17. 17.64² =
  18. 18.78² =
  19. 19.38² =
  20. 20.33² =
  21. 21.31² =
  22. 22.75² =
  23. 23.61² =
  24. 24.71² =
  25. 25.99² =
  26. 26.92² =
  27. 27.97² =
  28. 28.43² =
  29. 29.42² =
  30. 30.84² =
  31. 31.57² =
  32. 32.89² =
  33. 33.69² =
  34. 34.62² =
  35. 35.91² =
  36. 36.53² =
  37. 37.32² =
  38. 38.76² =
  39. 39.36² =
  40. 40.54² =

Answer key

  1. 9604
  2. 1936
  3. 2116
  4. 4624
  5. 2401
  6. 8836
  7. 5929
  8. 2704
  9. 6889
  10. 8649
  11. 1369
  12. 9025
  13. 3364
  14. 3025
  15. 7744
  16. 3969
  17. 4096
  18. 6084
  19. 1444
  20. 1089
  21. 961
  22. 5625
  23. 3721
  24. 5041
  25. 9801
  26. 8464
  27. 9409
  28. 1849
  29. 1764
  30. 7056
  31. 3249
  32. 7921
  33. 4761
  34. 3844
  35. 8281
  36. 2809
  37. 1024
  38. 5776
  39. 1296
  40. 2916

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