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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 751 · 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. 1.85² =
  2. 2.75² =
  3. 3.62² =
  4. 4.81² =
  5. 5.73² =
  6. 6.68² =
  7. 7.79² =
  8. 8.43² =
  9. 9.72² =
  10. 10.38² =
  11. 11.93² =
  12. 12.71² =
  13. 13.77² =
  14. 14.41² =
  15. 15.67² =
  16. 16.32² =
  17. 17.76² =
  18. 18.95² =
  19. 19.88² =
  20. 20.74² =
  21. 21.64² =
  22. 22.56² =
  23. 23.54² =
  24. 24.52² =
  25. 25.51² =
  26. 26.69² =
  27. 27.36² =
  28. 28.35² =
  29. 29.31² =
  30. 30.91² =
  31. 31.57² =
  32. 32.96² =
  33. 33.98² =
  34. 34.45² =
  35. 35.86² =
  36. 36.33² =
  37. 37.39² =
  38. 38.78² =
  39. 39.63² =
  40. 40.37² =

Answer key

  1. 7225
  2. 5625
  3. 3844
  4. 6561
  5. 5329
  6. 4624
  7. 6241
  8. 1849
  9. 5184
  10. 1444
  11. 8649
  12. 5041
  13. 5929
  14. 1681
  15. 4489
  16. 1024
  17. 5776
  18. 9025
  19. 7744
  20. 5476
  21. 4096
  22. 3136
  23. 2916
  24. 2704
  25. 2601
  26. 4761
  27. 1296
  28. 1225
  29. 961
  30. 8281
  31. 3249
  32. 9216
  33. 9604
  34. 2025
  35. 7396
  36. 1089
  37. 1521
  38. 6084
  39. 3969
  40. 1369

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