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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 629 · 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. 1.47² =
  2. 2.74² =
  3. 3.87² =
  4. 4.71² =
  5. 5.88² =
  6. 6.84² =
  7. 7.34² =
  8. 8.44² =
  9. 9.67² =
  10. 10.65² =
  11. 11.96² =
  12. 12.41² =
  13. 13.62² =
  14. 14.91² =
  15. 15.61² =
  16. 16.51² =
  17. 17.37² =
  18. 18.31² =
  19. 19.49² =
  20. 20.54² =
  21. 21.93² =
  22. 22.46² =
  23. 23.69² =
  24. 24.45² =
  25. 25.43² =
  26. 26.81² =
  27. 27.59² =
  28. 28.35² =
  29. 29.89² =
  30. 30.82² =
  31. 31.92² =
  32. 32.83² =
  33. 33.98² =
  34. 34.39² =
  35. 35.95² =
  36. 36.55² =
  37. 37.78² =
  38. 38.56² =
  39. 39.77² =
  40. 40.76² =

Answer key

  1. 2209
  2. 5476
  3. 7569
  4. 5041
  5. 7744
  6. 7056
  7. 1156
  8. 1936
  9. 4489
  10. 4225
  11. 9216
  12. 1681
  13. 3844
  14. 8281
  15. 3721
  16. 2601
  17. 1369
  18. 961
  19. 2401
  20. 2916
  21. 8649
  22. 2116
  23. 4761
  24. 2025
  25. 1849
  26. 6561
  27. 3481
  28. 1225
  29. 7921
  30. 6724
  31. 8464
  32. 6889
  33. 9604
  34. 1521
  35. 9025
  36. 3025
  37. 6084
  38. 3136
  39. 5929
  40. 5776

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