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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 585 · 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. 1.91² =
  2. 2.88² =
  3. 3.45² =
  4. 4.61² =
  5. 5.56² =
  6. 6.46² =
  7. 7.39² =
  8. 8.66² =
  9. 9.83² =
  10. 10.89² =
  11. 11.33² =
  12. 12.41² =
  13. 13.72² =
  14. 14.82² =
  15. 15.78² =
  16. 16.52² =
  17. 17.32² =
  18. 18.65² =
  19. 19.36² =
  20. 20.37² =
  21. 21.31² =
  22. 22.71² =
  23. 23.84² =
  24. 24.77² =
  25. 25.98² =
  26. 26.47² =
  27. 27.96² =
  28. 28.75² =
  29. 29.51² =
  30. 30.35² =
  31. 31.34² =
  32. 32.95² =
  33. 33.63² =
  34. 34.79² =
  35. 35.57² =
  36. 36.81² =
  37. 37.69² =
  38. 38.53² =
  39. 39.73² =
  40. 40.97² =

Answer key

  1. 8281
  2. 7744
  3. 2025
  4. 3721
  5. 3136
  6. 2116
  7. 1521
  8. 4356
  9. 6889
  10. 7921
  11. 1089
  12. 1681
  13. 5184
  14. 6724
  15. 6084
  16. 2704
  17. 1024
  18. 4225
  19. 1296
  20. 1369
  21. 961
  22. 5041
  23. 7056
  24. 5929
  25. 9604
  26. 2209
  27. 9216
  28. 5625
  29. 2601
  30. 1225
  31. 1156
  32. 9025
  33. 3969
  34. 6241
  35. 3249
  36. 6561
  37. 4761
  38. 2809
  39. 5329
  40. 9409

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