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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 127 · 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. 1.64² =
  2. 2.95² =
  3. 3.38² =
  4. 4.33² =
  5. 5.52² =
  6. 6.58² =
  7. 7.83² =
  8. 8.93² =
  9. 9.43² =
  10. 10.92² =
  11. 11.69² =
  12. 12.67² =
  13. 13.51² =
  14. 14.41² =
  15. 15.45² =
  16. 16.82² =
  17. 17.87² =
  18. 18.88² =
  19. 19.39² =
  20. 20.71² =
  21. 21.66² =
  22. 22.75² =
  23. 23.36² =
  24. 24.55² =
  25. 25.61² =
  26. 26.56² =
  27. 27.31² =
  28. 28.81² =
  29. 29.34² =
  30. 30.62² =
  31. 31.47² =
  32. 32.49² =
  33. 33.42² =
  34. 34.48² =
  35. 35.46² =
  36. 36.77² =
  37. 37.99² =
  38. 38.94² =
  39. 39.63² =
  40. 40.59² =

Answer key

  1. 4096
  2. 9025
  3. 1444
  4. 1089
  5. 2704
  6. 3364
  7. 6889
  8. 8649
  9. 1849
  10. 8464
  11. 4761
  12. 4489
  13. 2601
  14. 1681
  15. 2025
  16. 6724
  17. 7569
  18. 7744
  19. 1521
  20. 5041
  21. 4356
  22. 5625
  23. 1296
  24. 3025
  25. 3721
  26. 3136
  27. 961
  28. 6561
  29. 1156
  30. 3844
  31. 2209
  32. 2401
  33. 1764
  34. 2304
  35. 2116
  36. 5929
  37. 9801
  38. 8836
  39. 3969
  40. 3481

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