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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 435 · 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. 1.68² =
  2. 2.41² =
  3. 3.69² =
  4. 4.75² =
  5. 5.88² =
  6. 6.51² =
  7. 7.61² =
  8. 8.44² =
  9. 9.72² =
  10. 10.32² =
  11. 11.39² =
  12. 12.45² =
  13. 13.87² =
  14. 14.77² =
  15. 15.63² =
  16. 16.56² =
  17. 17.43² =
  18. 18.52² =
  19. 19.71² =
  20. 20.58² =
  21. 21.89² =
  22. 22.95² =
  23. 23.34² =
  24. 24.53² =
  25. 25.55² =
  26. 26.47² =
  27. 27.82² =
  28. 28.46² =
  29. 29.62² =
  30. 30.84² =
  31. 31.76² =
  32. 32.86² =
  33. 33.49² =
  34. 34.31² =
  35. 35.54² =
  36. 36.81² =
  37. 37.91² =
  38. 38.97² =
  39. 39.99² =
  40. 40.48² =

Answer key

  1. 4624
  2. 1681
  3. 4761
  4. 5625
  5. 7744
  6. 2601
  7. 3721
  8. 1936
  9. 5184
  10. 1024
  11. 1521
  12. 2025
  13. 7569
  14. 5929
  15. 3969
  16. 3136
  17. 1849
  18. 2704
  19. 5041
  20. 3364
  21. 7921
  22. 9025
  23. 1156
  24. 2809
  25. 3025
  26. 2209
  27. 6724
  28. 2116
  29. 3844
  30. 7056
  31. 5776
  32. 7396
  33. 2401
  34. 961
  35. 2916
  36. 6561
  37. 8281
  38. 9409
  39. 9801
  40. 2304

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