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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 434 · 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. 1.69² =
  2. 2.91² =
  3. 3.56² =
  4. 4.84² =
  5. 5.99² =
  6. 6.58² =
  7. 7.34² =
  8. 8.71² =
  9. 9.54² =
  10. 10.79² =
  11. 11.37² =
  12. 12.45² =
  13. 13.87² =
  14. 14.57² =
  15. 15.75² =
  16. 16.62² =
  17. 17.89² =
  18. 18.44² =
  19. 19.41² =
  20. 20.38² =
  21. 21.96² =
  22. 22.55² =
  23. 23.94² =
  24. 24.95² =
  25. 25.83² =
  26. 26.36² =
  27. 27.81² =
  28. 28.35² =
  29. 29.74² =
  30. 30.65² =
  31. 31.39² =
  32. 32.93² =
  33. 33.82² =
  34. 34.51² =
  35. 35.63² =
  36. 36.97² =
  37. 37.52² =
  38. 38.68² =
  39. 39.89² =
  40. 40.48² =

Answer key

  1. 4761
  2. 8281
  3. 3136
  4. 7056
  5. 9801
  6. 3364
  7. 1156
  8. 5041
  9. 2916
  10. 6241
  11. 1369
  12. 2025
  13. 7569
  14. 3249
  15. 5625
  16. 3844
  17. 7921
  18. 1936
  19. 1681
  20. 1444
  21. 9216
  22. 3025
  23. 8836
  24. 9025
  25. 6889
  26. 1296
  27. 6561
  28. 1225
  29. 5476
  30. 4225
  31. 1521
  32. 8649
  33. 6724
  34. 2601
  35. 3969
  36. 9409
  37. 2704
  38. 4624
  39. 7921
  40. 2304

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