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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 648 · 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. 1.75² =
  2. 2.63² =
  3. 3.68² =
  4. 4.45² =
  5. 5.81² =
  6. 6.76² =
  7. 7.35² =
  8. 8.61² =
  9. 9.92² =
  10. 10.77² =
  11. 11.98² =
  12. 12.46² =
  13. 13.38² =
  14. 14.84² =
  15. 15.31² =
  16. 16.93² =
  17. 17.41² =
  18. 18.97² =
  19. 19.86² =
  20. 20.69² =
  21. 21.71² =
  22. 22.51² =
  23. 23.83² =
  24. 24.74² =
  25. 25.47² =
  26. 26.34² =
  27. 27.48² =
  28. 28.55² =
  29. 29.79² =
  30. 30.43² =
  31. 31.62² =
  32. 32.78² =
  33. 33.88² =
  34. 34.67² =
  35. 35.91² =
  36. 36.49² =
  37. 37.64² =
  38. 38.95² =
  39. 39.56² =
  40. 40.57² =

Answer key

  1. 5625
  2. 3969
  3. 4624
  4. 2025
  5. 6561
  6. 5776
  7. 1225
  8. 3721
  9. 8464
  10. 5929
  11. 9604
  12. 2116
  13. 1444
  14. 7056
  15. 961
  16. 8649
  17. 1681
  18. 9409
  19. 7396
  20. 4761
  21. 5041
  22. 2601
  23. 6889
  24. 5476
  25. 2209
  26. 1156
  27. 2304
  28. 3025
  29. 6241
  30. 1849
  31. 3844
  32. 6084
  33. 7744
  34. 4489
  35. 8281
  36. 2401
  37. 4096
  38. 9025
  39. 3136
  40. 3249

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