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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 801 · 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. 1.48² =
  2. 2.78² =
  3. 3.69² =
  4. 4.37² =
  5. 5.47² =
  6. 6.49² =
  7. 7.35² =
  8. 8.63² =
  9. 9.95² =
  10. 10.84² =
  11. 11.61² =
  12. 12.66² =
  13. 13.65² =
  14. 14.45² =
  15. 15.42² =
  16. 16.91² =
  17. 17.87² =
  18. 18.94² =
  19. 19.41² =
  20. 20.39² =
  21. 21.51² =
  22. 22.96² =
  23. 23.71² =
  24. 24.46² =
  25. 25.56² =
  26. 26.36² =
  27. 27.68² =
  28. 28.31² =
  29. 29.72² =
  30. 30.81² =
  31. 31.97² =
  32. 32.74² =
  33. 33.82² =
  34. 34.62² =
  35. 35.76² =
  36. 36.53² =
  37. 37.89² =
  38. 38.44² =
  39. 39.99² =
  40. 40.73² =

Answer key

  1. 2304
  2. 6084
  3. 4761
  4. 1369
  5. 2209
  6. 2401
  7. 1225
  8. 3969
  9. 9025
  10. 7056
  11. 3721
  12. 4356
  13. 4225
  14. 2025
  15. 1764
  16. 8281
  17. 7569
  18. 8836
  19. 1681
  20. 1521
  21. 2601
  22. 9216
  23. 5041
  24. 2116
  25. 3136
  26. 1296
  27. 4624
  28. 961
  29. 5184
  30. 6561
  31. 9409
  32. 5476
  33. 6724
  34. 3844
  35. 5776
  36. 2809
  37. 7921
  38. 1936
  39. 9801
  40. 5329

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