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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 412 · 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. 1.87² =
  2. 2.39² =
  3. 3.45² =
  4. 4.74² =
  5. 5.49² =
  6. 6.32² =
  7. 7.69² =
  8. 8.61² =
  9. 9.43² =
  10. 10.85² =
  11. 11.77² =
  12. 12.64² =
  13. 13.48² =
  14. 14.92² =
  15. 15.55² =
  16. 16.79² =
  17. 17.47² =
  18. 18.51² =
  19. 19.99² =
  20. 20.88² =
  21. 21.82² =
  22. 22.59² =
  23. 23.41² =
  24. 24.36² =
  25. 25.53² =
  26. 26.83² =
  27. 27.34² =
  28. 28.89² =
  29. 29.91² =
  30. 30.66² =
  31. 31.35² =
  32. 32.81² =
  33. 33.37² =
  34. 34.97² =
  35. 35.58² =
  36. 36.44² =
  37. 37.96² =
  38. 38.94² =
  39. 39.95² =
  40. 40.42² =

Answer key

  1. 7569
  2. 1521
  3. 2025
  4. 5476
  5. 2401
  6. 1024
  7. 4761
  8. 3721
  9. 1849
  10. 7225
  11. 5929
  12. 4096
  13. 2304
  14. 8464
  15. 3025
  16. 6241
  17. 2209
  18. 2601
  19. 9801
  20. 7744
  21. 6724
  22. 3481
  23. 1681
  24. 1296
  25. 2809
  26. 6889
  27. 1156
  28. 7921
  29. 8281
  30. 4356
  31. 1225
  32. 6561
  33. 1369
  34. 9409
  35. 3364
  36. 1936
  37. 9216
  38. 8836
  39. 9025
  40. 1764

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