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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 515 · 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. 1.76² =
  2. 2.45² =
  3. 3.64² =
  4. 4.65² =
  5. 5.33² =
  6. 6.51² =
  7. 7.88² =
  8. 8.91² =
  9. 9.97² =
  10. 10.46² =
  11. 11.56² =
  12. 12.75² =
  13. 13.39² =
  14. 14.92² =
  15. 15.79² =
  16. 16.42² =
  17. 17.43² =
  18. 18.87² =
  19. 19.52² =
  20. 20.34² =
  21. 21.99² =
  22. 22.61² =
  23. 23.77² =
  24. 24.62² =
  25. 25.55² =
  26. 26.36² =
  27. 27.84² =
  28. 28.41² =
  29. 29.82² =
  30. 30.81² =
  31. 31.59² =
  32. 32.95² =
  33. 33.67² =
  34. 34.53² =
  35. 35.35² =
  36. 36.68² =
  37. 37.83² =
  38. 38.63² =
  39. 39.71² =
  40. 40.48² =

Answer key

  1. 5776
  2. 2025
  3. 4096
  4. 4225
  5. 1089
  6. 2601
  7. 7744
  8. 8281
  9. 9409
  10. 2116
  11. 3136
  12. 5625
  13. 1521
  14. 8464
  15. 6241
  16. 1764
  17. 1849
  18. 7569
  19. 2704
  20. 1156
  21. 9801
  22. 3721
  23. 5929
  24. 3844
  25. 3025
  26. 1296
  27. 7056
  28. 1681
  29. 6724
  30. 6561
  31. 3481
  32. 9025
  33. 4489
  34. 2809
  35. 1225
  36. 4624
  37. 6889
  38. 3969
  39. 5041
  40. 2304

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