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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 166 · 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. 1.51² =
  2. 2.56² =
  3. 3.49² =
  4. 4.99² =
  5. 5.61² =
  6. 6.52² =
  7. 7.48² =
  8. 8.45² =
  9. 9.91² =
  10. 10.32² =
  11. 11.71² =
  12. 12.41² =
  13. 13.37² =
  14. 14.33² =
  15. 15.72² =
  16. 16.43² =
  17. 17.63² =
  18. 18.74² =
  19. 19.59² =
  20. 20.85² =
  21. 21.84² =
  22. 22.98² =
  23. 23.36² =
  24. 24.58² =
  25. 25.95² =
  26. 26.83² =
  27. 27.47² =
  28. 28.87² =
  29. 29.93² =
  30. 30.53² =
  31. 31.64² =
  32. 32.44² =
  33. 33.96² =
  34. 34.73² =
  35. 35.81² =
  36. 36.46² =
  37. 37.75² =
  38. 38.78² =
  39. 39.57² =
  40. 40.86² =

Answer key

  1. 2601
  2. 3136
  3. 2401
  4. 9801
  5. 3721
  6. 2704
  7. 2304
  8. 2025
  9. 8281
  10. 1024
  11. 5041
  12. 1681
  13. 1369
  14. 1089
  15. 5184
  16. 1849
  17. 3969
  18. 5476
  19. 3481
  20. 7225
  21. 7056
  22. 9604
  23. 1296
  24. 3364
  25. 9025
  26. 6889
  27. 2209
  28. 7569
  29. 8649
  30. 2809
  31. 4096
  32. 1936
  33. 9216
  34. 5329
  35. 6561
  36. 2116
  37. 5625
  38. 6084
  39. 3249
  40. 7396

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