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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 459 · 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. 1.77² =
  2. 2.57² =
  3. 3.36² =
  4. 4.81² =
  5. 5.65² =
  6. 6.51² =
  7. 7.49² =
  8. 8.66² =
  9. 9.48² =
  10. 10.92² =
  11. 11.33² =
  12. 12.53² =
  13. 13.52² =
  14. 14.83² =
  15. 15.75² =
  16. 16.85² =
  17. 17.82² =
  18. 18.87² =
  19. 19.93² =
  20. 20.78² =
  21. 21.46² =
  22. 22.86² =
  23. 23.38² =
  24. 24.95² =
  25. 25.89² =
  26. 26.97² =
  27. 27.99² =
  28. 28.58² =
  29. 29.31² =
  30. 30.69² =
  31. 31.96² =
  32. 32.45² =
  33. 33.73² =
  34. 34.79² =
  35. 35.71² =
  36. 36.56² =
  37. 37.35² =
  38. 38.59² =
  39. 39.98² =
  40. 40.64² =

Answer key

  1. 5929
  2. 3249
  3. 1296
  4. 6561
  5. 4225
  6. 2601
  7. 2401
  8. 4356
  9. 2304
  10. 8464
  11. 1089
  12. 2809
  13. 2704
  14. 6889
  15. 5625
  16. 7225
  17. 6724
  18. 7569
  19. 8649
  20. 6084
  21. 2116
  22. 7396
  23. 1444
  24. 9025
  25. 7921
  26. 9409
  27. 9801
  28. 3364
  29. 961
  30. 4761
  31. 9216
  32. 2025
  33. 5329
  34. 6241
  35. 5041
  36. 3136
  37. 1225
  38. 3481
  39. 9604
  40. 4096

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