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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 89 · 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. 1.83² =
  2. 2.85² =
  3. 3.98² =
  4. 4.34² =
  5. 5.52² =
  6. 6.41² =
  7. 7.42² =
  8. 8.82² =
  9. 9.53² =
  10. 10.81² =
  11. 11.97² =
  12. 12.32² =
  13. 13.48² =
  14. 14.64² =
  15. 15.99² =
  16. 16.67² =
  17. 17.68² =
  18. 18.74² =
  19. 19.88² =
  20. 20.71² =
  21. 21.31² =
  22. 22.69² =
  23. 23.62² =
  24. 24.77² =
  25. 25.84² =
  26. 26.61² =
  27. 27.51² =
  28. 28.56² =
  29. 29.87² =
  30. 30.95² =
  31. 31.44² =
  32. 32.86² =
  33. 33.35² =
  34. 34.72² =
  35. 35.91² =
  36. 36.37² =
  37. 37.78² =
  38. 38.36² =
  39. 39.57² =
  40. 40.45² =

Answer key

  1. 6889
  2. 7225
  3. 9604
  4. 1156
  5. 2704
  6. 1681
  7. 1764
  8. 6724
  9. 2809
  10. 6561
  11. 9409
  12. 1024
  13. 2304
  14. 4096
  15. 9801
  16. 4489
  17. 4624
  18. 5476
  19. 7744
  20. 5041
  21. 961
  22. 4761
  23. 3844
  24. 5929
  25. 7056
  26. 3721
  27. 2601
  28. 3136
  29. 7569
  30. 9025
  31. 1936
  32. 7396
  33. 1225
  34. 5184
  35. 8281
  36. 1369
  37. 6084
  38. 1296
  39. 3249
  40. 2025

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