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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 795 · 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. 1.52² =
  2. 2.58² =
  3. 3.64² =
  4. 4.66² =
  5. 5.31² =
  6. 6.77² =
  7. 7.71² =
  8. 8.53² =
  9. 9.93² =
  10. 10.47² =
  11. 11.43² =
  12. 12.96² =
  13. 13.65² =
  14. 14.63² =
  15. 15.38² =
  16. 16.51² =
  17. 17.37² =
  18. 18.56² =
  19. 19.61² =
  20. 20.54² =
  21. 21.41² =
  22. 22.62² =
  23. 23.75² =
  24. 24.35² =
  25. 25.78² =
  26. 26.69² =
  27. 27.45² =
  28. 28.34² =
  29. 29.46² =
  30. 30.55² =
  31. 31.44² =
  32. 32.89² =
  33. 33.49² =
  34. 34.86² =
  35. 35.48² =
  36. 36.74² =
  37. 37.79² =
  38. 38.94² =
  39. 39.81² =
  40. 40.95² =

Answer key

  1. 2704
  2. 3364
  3. 4096
  4. 4356
  5. 961
  6. 5929
  7. 5041
  8. 2809
  9. 8649
  10. 2209
  11. 1849
  12. 9216
  13. 4225
  14. 3969
  15. 1444
  16. 2601
  17. 1369
  18. 3136
  19. 3721
  20. 2916
  21. 1681
  22. 3844
  23. 5625
  24. 1225
  25. 6084
  26. 4761
  27. 2025
  28. 1156
  29. 2116
  30. 3025
  31. 1936
  32. 7921
  33. 2401
  34. 7396
  35. 2304
  36. 5476
  37. 6241
  38. 8836
  39. 6561
  40. 9025

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