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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 771 · 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. 1.66² =
  2. 2.71² =
  3. 3.31² =
  4. 4.57² =
  5. 5.77² =
  6. 6.55² =
  7. 7.83² =
  8. 8.51² =
  9. 9.61² =
  10. 10.32² =
  11. 11.75² =
  12. 12.64² =
  13. 13.97² =
  14. 14.69² =
  15. 15.74² =
  16. 16.39² =
  17. 17.73² =
  18. 18.37² =
  19. 19.96² =
  20. 20.34² =
  21. 21.44² =
  22. 22.59² =
  23. 23.47² =
  24. 24.48² =
  25. 25.38² =
  26. 26.43² =
  27. 27.95² =
  28. 28.46² =
  29. 29.72² =
  30. 30.65² =
  31. 31.49² =
  32. 32.88² =
  33. 33.89² =
  34. 34.63² =
  35. 35.87² =
  36. 36.56² =
  37. 37.99² =
  38. 38.41² =
  39. 39.84² =
  40. 40.35² =

Answer key

  1. 4356
  2. 5041
  3. 961
  4. 3249
  5. 5929
  6. 3025
  7. 6889
  8. 2601
  9. 3721
  10. 1024
  11. 5625
  12. 4096
  13. 9409
  14. 4761
  15. 5476
  16. 1521
  17. 5329
  18. 1369
  19. 9216
  20. 1156
  21. 1936
  22. 3481
  23. 2209
  24. 2304
  25. 1444
  26. 1849
  27. 9025
  28. 2116
  29. 5184
  30. 4225
  31. 2401
  32. 7744
  33. 7921
  34. 3969
  35. 7569
  36. 3136
  37. 9801
  38. 1681
  39. 7056
  40. 1225

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