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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 561 · 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. 1.76² =
  2. 2.44² =
  3. 3.91² =
  4. 4.36² =
  5. 5.93² =
  6. 6.98² =
  7. 7.94² =
  8. 8.31² =
  9. 9.45² =
  10. 10.54² =
  11. 11.49² =
  12. 12.42² =
  13. 13.32² =
  14. 14.41² =
  15. 15.83² =
  16. 16.82² =
  17. 17.97² =
  18. 18.84² =
  19. 19.38² =
  20. 20.56² =
  21. 21.66² =
  22. 22.95² =
  23. 23.39² =
  24. 24.81² =
  25. 25.79² =
  26. 26.51² =
  27. 27.58² =
  28. 28.57² =
  29. 29.71² =
  30. 30.33² =
  31. 31.52² =
  32. 32.74² =
  33. 33.75² =
  34. 34.62² =
  35. 35.37² =
  36. 36.55² =
  37. 37.86² =
  38. 38.92² =
  39. 39.88² =
  40. 40.43² =

Answer key

  1. 5776
  2. 1936
  3. 8281
  4. 1296
  5. 8649
  6. 9604
  7. 8836
  8. 961
  9. 2025
  10. 2916
  11. 2401
  12. 1764
  13. 1024
  14. 1681
  15. 6889
  16. 6724
  17. 9409
  18. 7056
  19. 1444
  20. 3136
  21. 4356
  22. 9025
  23. 1521
  24. 6561
  25. 6241
  26. 2601
  27. 3364
  28. 3249
  29. 5041
  30. 1089
  31. 2704
  32. 5476
  33. 5625
  34. 3844
  35. 1369
  36. 3025
  37. 7396
  38. 8464
  39. 7744
  40. 1849

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