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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 825 · 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. 1.57² =
  2. 2.38² =
  3. 3.89² =
  4. 4.48² =
  5. 5.37² =
  6. 6.54² =
  7. 7.64² =
  8. 8.76² =
  9. 9.52² =
  10. 10.86² =
  11. 11.41² =
  12. 12.93² =
  13. 13.84² =
  14. 14.61² =
  15. 15.35² =
  16. 16.67² =
  17. 17.71² =
  18. 18.78² =
  19. 19.42² =
  20. 20.49² =
  21. 21.31² =
  22. 22.97² =
  23. 23.83² =
  24. 24.56² =
  25. 25.51² =
  26. 26.55² =
  27. 27.92² =
  28. 28.58² =
  29. 29.62² =
  30. 30.79² =
  31. 31.45² =
  32. 32.82² =
  33. 33.46² =
  34. 34.91² =
  35. 35.44² =
  36. 36.95² =
  37. 37.81² =
  38. 38.34² =
  39. 39.74² =
  40. 40.73² =

Answer key

  1. 3249
  2. 1444
  3. 7921
  4. 2304
  5. 1369
  6. 2916
  7. 4096
  8. 5776
  9. 2704
  10. 7396
  11. 1681
  12. 8649
  13. 7056
  14. 3721
  15. 1225
  16. 4489
  17. 5041
  18. 6084
  19. 1764
  20. 2401
  21. 961
  22. 9409
  23. 6889
  24. 3136
  25. 2601
  26. 3025
  27. 8464
  28. 3364
  29. 3844
  30. 6241
  31. 2025
  32. 6724
  33. 2116
  34. 8281
  35. 1936
  36. 9025
  37. 6561
  38. 1156
  39. 5476
  40. 5329

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