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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 256 · 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. 1.89² =
  2. 2.82² =
  3. 3.51² =
  4. 4.57² =
  5. 5.75² =
  6. 6.46² =
  7. 7.94² =
  8. 8.66² =
  9. 9.84² =
  10. 10.73² =
  11. 11.53² =
  12. 12.71² =
  13. 13.65² =
  14. 14.62² =
  15. 15.98² =
  16. 16.34² =
  17. 17.96² =
  18. 18.31² =
  19. 19.63² =
  20. 20.93² =
  21. 21.37² =
  22. 22.61² =
  23. 23.97² =
  24. 24.47² =
  25. 25.78² =
  26. 26.91² =
  27. 27.74² =
  28. 28.44² =
  29. 29.41² =
  30. 30.35² =
  31. 31.81² =
  32. 32.56² =
  33. 33.79² =
  34. 34.32² =
  35. 35.52² =
  36. 36.54² =
  37. 37.77² =
  38. 38.38² =
  39. 39.68² =
  40. 40.67² =

Answer key

  1. 7921
  2. 6724
  3. 2601
  4. 3249
  5. 5625
  6. 2116
  7. 8836
  8. 4356
  9. 7056
  10. 5329
  11. 2809
  12. 5041
  13. 4225
  14. 3844
  15. 9604
  16. 1156
  17. 9216
  18. 961
  19. 3969
  20. 8649
  21. 1369
  22. 3721
  23. 9409
  24. 2209
  25. 6084
  26. 8281
  27. 5476
  28. 1936
  29. 1681
  30. 1225
  31. 6561
  32. 3136
  33. 6241
  34. 1024
  35. 2704
  36. 2916
  37. 5929
  38. 1444
  39. 4624
  40. 4489

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