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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 749 · 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. 1.79² =
  2. 2.52² =
  3. 3.91² =
  4. 4.39² =
  5. 5.68² =
  6. 6.75² =
  7. 7.34² =
  8. 8.32² =
  9. 9.95² =
  10. 10.35² =
  11. 11.84² =
  12. 12.72² =
  13. 13.66² =
  14. 14.33² =
  15. 15.87² =
  16. 16.99² =
  17. 17.94² =
  18. 18.97² =
  19. 19.98² =
  20. 20.67² =
  21. 21.92² =
  22. 22.77² =
  23. 23.74² =
  24. 24.31² =
  25. 25.65² =
  26. 26.73² =
  27. 27.48² =
  28. 28.89² =
  29. 29.49² =
  30. 30.42² =
  31. 31.62² =
  32. 32.43² =
  33. 33.57² =
  34. 34.56² =
  35. 35.82² =
  36. 36.69² =
  37. 37.81² =
  38. 38.41² =
  39. 39.51² =
  40. 40.58² =

Answer key

  1. 6241
  2. 2704
  3. 8281
  4. 1521
  5. 4624
  6. 5625
  7. 1156
  8. 1024
  9. 9025
  10. 1225
  11. 7056
  12. 5184
  13. 4356
  14. 1089
  15. 7569
  16. 9801
  17. 8836
  18. 9409
  19. 9604
  20. 4489
  21. 8464
  22. 5929
  23. 5476
  24. 961
  25. 4225
  26. 5329
  27. 2304
  28. 7921
  29. 2401
  30. 1764
  31. 3844
  32. 1849
  33. 3249
  34. 3136
  35. 6724
  36. 4761
  37. 6561
  38. 1681
  39. 2601
  40. 3364

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