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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 603 · 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. 1.64² =
  2. 2.46² =
  3. 3.62² =
  4. 4.86² =
  5. 5.43² =
  6. 6.52² =
  7. 7.42² =
  8. 8.92² =
  9. 9.87² =
  10. 10.81² =
  11. 11.63² =
  12. 12.94² =
  13. 13.71² =
  14. 14.68² =
  15. 15.96² =
  16. 16.41² =
  17. 17.54² =
  18. 18.76² =
  19. 19.93² =
  20. 20.61² =
  21. 21.79² =
  22. 22.89² =
  23. 23.39² =
  24. 24.44² =
  25. 25.31² =
  26. 26.51² =
  27. 27.77² =
  28. 28.48² =
  29. 29.53² =
  30. 30.36² =
  31. 31.99² =
  32. 32.67² =
  33. 33.55² =
  34. 34.74² =
  35. 35.35² =
  36. 36.38² =
  37. 37.78² =
  38. 38.84² =
  39. 39.49² =
  40. 40.56² =

Answer key

  1. 4096
  2. 2116
  3. 3844
  4. 7396
  5. 1849
  6. 2704
  7. 1764
  8. 8464
  9. 7569
  10. 6561
  11. 3969
  12. 8836
  13. 5041
  14. 4624
  15. 9216
  16. 1681
  17. 2916
  18. 5776
  19. 8649
  20. 3721
  21. 6241
  22. 7921
  23. 1521
  24. 1936
  25. 961
  26. 2601
  27. 5929
  28. 2304
  29. 2809
  30. 1296
  31. 9801
  32. 4489
  33. 3025
  34. 5476
  35. 1225
  36. 1444
  37. 6084
  38. 7056
  39. 2401
  40. 3136

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