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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 311 · 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. 1.84² =
  2. 2.86² =
  3. 3.65² =
  4. 4.79² =
  5. 5.78² =
  6. 6.96² =
  7. 7.51² =
  8. 8.94² =
  9. 9.82² =
  10. 10.49² =
  11. 11.56² =
  12. 12.34² =
  13. 13.95² =
  14. 14.97² =
  15. 15.55² =
  16. 16.41² =
  17. 17.85² =
  18. 18.52² =
  19. 19.81² =
  20. 20.72² =
  21. 21.53² =
  22. 22.33² =
  23. 23.32² =
  24. 24.35² =
  25. 25.45² =
  26. 26.92² =
  27. 27.64² =
  28. 28.68² =
  29. 29.77² =
  30. 30.46² =
  31. 31.43² =
  32. 32.89² =
  33. 33.63² =
  34. 34.37² =
  35. 35.36² =
  36. 36.39² =
  37. 37.38² =
  38. 38.91² =
  39. 39.57² =
  40. 40.88² =

Answer key

  1. 7056
  2. 7396
  3. 4225
  4. 6241
  5. 6084
  6. 9216
  7. 2601
  8. 8836
  9. 6724
  10. 2401
  11. 3136
  12. 1156
  13. 9025
  14. 9409
  15. 3025
  16. 1681
  17. 7225
  18. 2704
  19. 6561
  20. 5184
  21. 2809
  22. 1089
  23. 1024
  24. 1225
  25. 2025
  26. 8464
  27. 4096
  28. 4624
  29. 5929
  30. 2116
  31. 1849
  32. 7921
  33. 3969
  34. 1369
  35. 1296
  36. 1521
  37. 1444
  38. 8281
  39. 3249
  40. 7744

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