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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 375 · 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. 1.94² =
  2. 2.91² =
  3. 3.78² =
  4. 4.68² =
  5. 5.99² =
  6. 6.42² =
  7. 7.48² =
  8. 8.33² =
  9. 9.74² =
  10. 10.75² =
  11. 11.44² =
  12. 12.84² =
  13. 13.81² =
  14. 14.62² =
  15. 15.72² =
  16. 16.65² =
  17. 17.95² =
  18. 18.83² =
  19. 19.89² =
  20. 20.61² =
  21. 21.63² =
  22. 22.51² =
  23. 23.97² =
  24. 24.64² =
  25. 25.96² =
  26. 26.93² =
  27. 27.43² =
  28. 28.55² =
  29. 29.66² =
  30. 30.35² =
  31. 31.41² =
  32. 32.54² =
  33. 33.58² =
  34. 34.82² =
  35. 35.56² =
  36. 36.45² =
  37. 37.38² =
  38. 38.87² =
  39. 39.46² =
  40. 40.32² =

Answer key

  1. 8836
  2. 8281
  3. 6084
  4. 4624
  5. 9801
  6. 1764
  7. 2304
  8. 1089
  9. 5476
  10. 5625
  11. 1936
  12. 7056
  13. 6561
  14. 3844
  15. 5184
  16. 4225
  17. 9025
  18. 6889
  19. 7921
  20. 3721
  21. 3969
  22. 2601
  23. 9409
  24. 4096
  25. 9216
  26. 8649
  27. 1849
  28. 3025
  29. 4356
  30. 1225
  31. 1681
  32. 2916
  33. 3364
  34. 6724
  35. 3136
  36. 2025
  37. 1444
  38. 7569
  39. 2116
  40. 1024

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