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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 258 · 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. 2.76² =
  3. 3.81² =
  4. 4.89² =
  5. 5.95² =
  6. 6.51² =
  7. 7.62² =
  8. 8.42² =
  9. 9.41² =
  10. 10.59² =
  11. 11.49² =
  12. 12.31² =
  13. 13.43² =
  14. 14.88² =
  15. 15.34² =
  16. 16.58² =
  17. 17.78² =
  18. 18.91² =
  19. 19.48² =
  20. 20.74² =
  21. 21.37² =
  22. 22.98² =
  23. 23.97² =
  24. 24.54² =
  25. 25.61² =
  26. 26.72² =
  27. 27.45² =
  28. 28.71² =
  29. 29.44² =
  30. 30.81² =
  31. 31.39² =
  32. 32.79² =
  33. 33.35² =
  34. 34.69² =
  35. 35.85² =
  36. 36.36² =
  37. 37.65² =
  38. 38.93² =
  39. 39.87² =
  40. 40.77² =

Answer key

  1. 2704
  2. 5776
  3. 6561
  4. 7921
  5. 9025
  6. 2601
  7. 3844
  8. 1764
  9. 1681
  10. 3481
  11. 2401
  12. 961
  13. 1849
  14. 7744
  15. 1156
  16. 3364
  17. 6084
  18. 8281
  19. 2304
  20. 5476
  21. 1369
  22. 9604
  23. 9409
  24. 2916
  25. 3721
  26. 5184
  27. 2025
  28. 5041
  29. 1936
  30. 6561
  31. 1521
  32. 6241
  33. 1225
  34. 4761
  35. 7225
  36. 1296
  37. 4225
  38. 8649
  39. 7569
  40. 5929

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