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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 815 · 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. 2.32² =
  3. 3.79² =
  4. 4.92² =
  5. 5.63² =
  6. 6.48² =
  7. 7.67² =
  8. 8.51² =
  9. 9.41² =
  10. 10.43² =
  11. 11.47² =
  12. 12.81² =
  13. 13.39² =
  14. 14.86² =
  15. 15.78² =
  16. 16.66² =
  17. 17.55² =
  18. 18.69² =
  19. 19.52² =
  20. 20.95² =
  21. 21.84² =
  22. 22.61² =
  23. 23.56² =
  24. 24.74² =
  25. 25.68² =
  26. 26.89² =
  27. 27.45² =
  28. 28.96² =
  29. 29.58² =
  30. 30.62² =
  31. 31.38² =
  32. 32.73² =
  33. 33.82² =
  34. 34.44² =
  35. 35.94² =
  36. 36.42² =
  37. 37.76² =
  38. 38.36² =
  39. 39.87² =
  40. 40.49² =

Answer key

  1. 6889
  2. 1024
  3. 6241
  4. 8464
  5. 3969
  6. 2304
  7. 4489
  8. 2601
  9. 1681
  10. 1849
  11. 2209
  12. 6561
  13. 1521
  14. 7396
  15. 6084
  16. 4356
  17. 3025
  18. 4761
  19. 2704
  20. 9025
  21. 7056
  22. 3721
  23. 3136
  24. 5476
  25. 4624
  26. 7921
  27. 2025
  28. 9216
  29. 3364
  30. 3844
  31. 1444
  32. 5329
  33. 6724
  34. 1936
  35. 8836
  36. 1764
  37. 5776
  38. 1296
  39. 7569
  40. 2401

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