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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 774 · 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. 1.84² =
  2. 2.53² =
  3. 3.89² =
  4. 4.98² =
  5. 5.66² =
  6. 6.47² =
  7. 7.51² =
  8. 8.56² =
  9. 9.93² =
  10. 10.65² =
  11. 11.31² =
  12. 12.87² =
  13. 13.33² =
  14. 14.36² =
  15. 15.61² =
  16. 16.48² =
  17. 17.71² =
  18. 18.49² =
  19. 19.92² =
  20. 20.57² =
  21. 21.91² =
  22. 22.86² =
  23. 23.44² =
  24. 24.88² =
  25. 25.46² =
  26. 26.64² =
  27. 27.43² =
  28. 28.55² =
  29. 29.35² =
  30. 30.96² =
  31. 31.81² =
  32. 32.97² =
  33. 33.94² =
  34. 34.73² =
  35. 35.78² =
  36. 36.52² =
  37. 37.74² =
  38. 38.34² =
  39. 39.99² =
  40. 40.32² =

Answer key

  1. 7056
  2. 2809
  3. 7921
  4. 9604
  5. 4356
  6. 2209
  7. 2601
  8. 3136
  9. 8649
  10. 4225
  11. 961
  12. 7569
  13. 1089
  14. 1296
  15. 3721
  16. 2304
  17. 5041
  18. 2401
  19. 8464
  20. 3249
  21. 8281
  22. 7396
  23. 1936
  24. 7744
  25. 2116
  26. 4096
  27. 1849
  28. 3025
  29. 1225
  30. 9216
  31. 6561
  32. 9409
  33. 8836
  34. 5329
  35. 6084
  36. 2704
  37. 5476
  38. 1156
  39. 9801
  40. 1024

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