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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 655 · 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. 1.68² =
  2. 2.51² =
  3. 3.32² =
  4. 4.38² =
  5. 5.74² =
  6. 6.66² =
  7. 7.85² =
  8. 8.47² =
  9. 9.59² =
  10. 10.46² =
  11. 11.61² =
  12. 12.53² =
  13. 13.34² =
  14. 14.31² =
  15. 15.84² =
  16. 16.88² =
  17. 17.41² =
  18. 18.86² =
  19. 19.49² =
  20. 20.72² =
  21. 21.52² =
  22. 22.64² =
  23. 23.75² =
  24. 24.71² =
  25. 25.44² =
  26. 26.96² =
  27. 27.91² =
  28. 28.42² =
  29. 29.54² =
  30. 30.97² =
  31. 31.77² =
  32. 32.63² =
  33. 33.95² =
  34. 34.35² =
  35. 35.79² =
  36. 36.81² =
  37. 37.76² =
  38. 38.89² =
  39. 39.65² =
  40. 40.87² =

Answer key

  1. 4624
  2. 2601
  3. 1024
  4. 1444
  5. 5476
  6. 4356
  7. 7225
  8. 2209
  9. 3481
  10. 2116
  11. 3721
  12. 2809
  13. 1156
  14. 961
  15. 7056
  16. 7744
  17. 1681
  18. 7396
  19. 2401
  20. 5184
  21. 2704
  22. 4096
  23. 5625
  24. 5041
  25. 1936
  26. 9216
  27. 8281
  28. 1764
  29. 2916
  30. 9409
  31. 5929
  32. 3969
  33. 9025
  34. 1225
  35. 6241
  36. 6561
  37. 5776
  38. 7921
  39. 4225
  40. 7569

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