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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 264 · 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. 2.48² =
  3. 3.62² =
  4. 4.43² =
  5. 5.32² =
  6. 6.44² =
  7. 7.91² =
  8. 8.85² =
  9. 9.61² =
  10. 10.47² =
  11. 11.45² =
  12. 12.41² =
  13. 13.38² =
  14. 14.63² =
  15. 15.97² =
  16. 16.55² =
  17. 17.88² =
  18. 18.57² =
  19. 19.73² =
  20. 20.56² =
  21. 21.84² =
  22. 22.51² =
  23. 23.31² =
  24. 24.71² =
  25. 25.86² =
  26. 26.94² =
  27. 27.37² =
  28. 28.33² =
  29. 29.69² =
  30. 30.78² =
  31. 31.58² =
  32. 32.77² =
  33. 33.34² =
  34. 34.82² =
  35. 35.75² =
  36. 36.68² =
  37. 37.95² =
  38. 38.53² =
  39. 39.93² =
  40. 40.99² =

Answer key

  1. 2704
  2. 2304
  3. 3844
  4. 1849
  5. 1024
  6. 1936
  7. 8281
  8. 7225
  9. 3721
  10. 2209
  11. 2025
  12. 1681
  13. 1444
  14. 3969
  15. 9409
  16. 3025
  17. 7744
  18. 3249
  19. 5329
  20. 3136
  21. 7056
  22. 2601
  23. 961
  24. 5041
  25. 7396
  26. 8836
  27. 1369
  28. 1089
  29. 4761
  30. 6084
  31. 3364
  32. 5929
  33. 1156
  34. 6724
  35. 5625
  36. 4624
  37. 9025
  38. 2809
  39. 8649
  40. 9801

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