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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 500 · 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. 1.98² =
  2. 2.47² =
  3. 3.76² =
  4. 4.32² =
  5. 5.35² =
  6. 6.83² =
  7. 7.69² =
  8. 8.82² =
  9. 9.61² =
  10. 10.79² =
  11. 11.85² =
  12. 12.71² =
  13. 13.89² =
  14. 14.84² =
  15. 15.43² =
  16. 16.38² =
  17. 17.74² =
  18. 18.64² =
  19. 19.53² =
  20. 20.75² =
  21. 21.39² =
  22. 22.81² =
  23. 23.51² =
  24. 24.34² =
  25. 25.63² =
  26. 26.62² =
  27. 27.33² =
  28. 28.45² =
  29. 29.49² =
  30. 30.41² =
  31. 31.67² =
  32. 32.93² =
  33. 33.92² =
  34. 34.46² =
  35. 35.94² =
  36. 36.31² =
  37. 37.86² =
  38. 38.78² =
  39. 39.77² =
  40. 40.42² =

Answer key

  1. 9604
  2. 2209
  3. 5776
  4. 1024
  5. 1225
  6. 6889
  7. 4761
  8. 6724
  9. 3721
  10. 6241
  11. 7225
  12. 5041
  13. 7921
  14. 7056
  15. 1849
  16. 1444
  17. 5476
  18. 4096
  19. 2809
  20. 5625
  21. 1521
  22. 6561
  23. 2601
  24. 1156
  25. 3969
  26. 3844
  27. 1089
  28. 2025
  29. 2401
  30. 1681
  31. 4489
  32. 8649
  33. 8464
  34. 2116
  35. 8836
  36. 961
  37. 7396
  38. 6084
  39. 5929
  40. 1764

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