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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 189 · 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. 1.44² =
  2. 2.76² =
  3. 3.34² =
  4. 4.69² =
  5. 5.71² =
  6. 6.39² =
  7. 7.82² =
  8. 8.91² =
  9. 9.57² =
  10. 10.61² =
  11. 11.98² =
  12. 12.81² =
  13. 13.36² =
  14. 14.37² =
  15. 15.74² =
  16. 16.56² =
  17. 17.87² =
  18. 18.95² =
  19. 19.67² =
  20. 20.59² =
  21. 21.78² =
  22. 22.42² =
  23. 23.51² =
  24. 24.46² =
  25. 25.31² =
  26. 26.54² =
  27. 27.38² =
  28. 28.45² =
  29. 29.32² =
  30. 30.62² =
  31. 31.83² =
  32. 32.66² =
  33. 33.47² =
  34. 34.43² =
  35. 35.75² =
  36. 36.41² =
  37. 37.93² =
  38. 38.49² =
  39. 39.96² =
  40. 40.85² =

Answer key

  1. 1936
  2. 5776
  3. 1156
  4. 4761
  5. 5041
  6. 1521
  7. 6724
  8. 8281
  9. 3249
  10. 3721
  11. 9604
  12. 6561
  13. 1296
  14. 1369
  15. 5476
  16. 3136
  17. 7569
  18. 9025
  19. 4489
  20. 3481
  21. 6084
  22. 1764
  23. 2601
  24. 2116
  25. 961
  26. 2916
  27. 1444
  28. 2025
  29. 1024
  30. 3844
  31. 6889
  32. 4356
  33. 2209
  34. 1849
  35. 5625
  36. 1681
  37. 8649
  38. 2401
  39. 9216
  40. 7225

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