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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 402 · 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. 1.61² =
  2. 2.46² =
  3. 3.84² =
  4. 4.97² =
  5. 5.59² =
  6. 6.41² =
  7. 7.88² =
  8. 8.35² =
  9. 9.73² =
  10. 10.49² =
  11. 11.68² =
  12. 12.43² =
  13. 13.33² =
  14. 14.74² =
  15. 15.82² =
  16. 16.56² =
  17. 17.79² =
  18. 18.64² =
  19. 19.51² =
  20. 20.94² =
  21. 21.58² =
  22. 22.44² =
  23. 23.81² =
  24. 24.67² =
  25. 25.32² =
  26. 26.72² =
  27. 27.45² =
  28. 28.55² =
  29. 29.31² =
  30. 30.37² =
  31. 31.75² =
  32. 32.63² =
  33. 33.99² =
  34. 34.34² =
  35. 35.66² =
  36. 36.57² =
  37. 37.62² =
  38. 38.65² =
  39. 39.83² =
  40. 40.89² =

Answer key

  1. 3721
  2. 2116
  3. 7056
  4. 9409
  5. 3481
  6. 1681
  7. 7744
  8. 1225
  9. 5329
  10. 2401
  11. 4624
  12. 1849
  13. 1089
  14. 5476
  15. 6724
  16. 3136
  17. 6241
  18. 4096
  19. 2601
  20. 8836
  21. 3364
  22. 1936
  23. 6561
  24. 4489
  25. 1024
  26. 5184
  27. 2025
  28. 3025
  29. 961
  30. 1369
  31. 5625
  32. 3969
  33. 9801
  34. 1156
  35. 4356
  36. 3249
  37. 3844
  38. 4225
  39. 6889
  40. 7921

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