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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 403 · 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. 1.81² =
  2. 2.31² =
  3. 3.83² =
  4. 4.59² =
  5. 5.92² =
  6. 6.46² =
  7. 7.62² =
  8. 8.41² =
  9. 9.61² =
  10. 10.45² =
  11. 11.91² =
  12. 12.52² =
  13. 13.72² =
  14. 14.47² =
  15. 15.85² =
  16. 16.64² =
  17. 17.93² =
  18. 18.66² =
  19. 19.51² =
  20. 20.43² =
  21. 21.99² =
  22. 22.37² =
  23. 23.82² =
  24. 24.48² =
  25. 25.71² =
  26. 26.34² =
  27. 27.76² =
  28. 28.69² =
  29. 29.44² =
  30. 30.87² =
  31. 31.56² =
  32. 32.58² =
  33. 33.77² =
  34. 34.57² =
  35. 35.78² =
  36. 36.79² =
  37. 37.32² =
  38. 38.75² =
  39. 39.95² =
  40. 40.67² =

Answer key

  1. 6561
  2. 961
  3. 6889
  4. 3481
  5. 8464
  6. 2116
  7. 3844
  8. 1681
  9. 3721
  10. 2025
  11. 8281
  12. 2704
  13. 5184
  14. 2209
  15. 7225
  16. 4096
  17. 8649
  18. 4356
  19. 2601
  20. 1849
  21. 9801
  22. 1369
  23. 6724
  24. 2304
  25. 5041
  26. 1156
  27. 5776
  28. 4761
  29. 1936
  30. 7569
  31. 3136
  32. 3364
  33. 5929
  34. 3249
  35. 6084
  36. 6241
  37. 1024
  38. 5625
  39. 9025
  40. 4489

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