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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 583 · 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. 2.55² =
  3. 3.31² =
  4. 4.71² =
  5. 5.34² =
  6. 6.48² =
  7. 7.51² =
  8. 8.38² =
  9. 9.35² =
  10. 10.61² =
  11. 11.78² =
  12. 12.84² =
  13. 13.56² =
  14. 14.66² =
  15. 15.76² =
  16. 16.91² =
  17. 17.41² =
  18. 18.37² =
  19. 19.63² =
  20. 20.45² =
  21. 21.68² =
  22. 22.99² =
  23. 23.65² =
  24. 24.64² =
  25. 25.69² =
  26. 26.92² =
  27. 27.93² =
  28. 28.72² =
  29. 29.39² =
  30. 30.44² =
  31. 31.98² =
  32. 32.83² =
  33. 33.89² =
  34. 34.97² =
  35. 35.52² =
  36. 36.86² =
  37. 37.54² =
  38. 38.77² =
  39. 39.59² =
  40. 40.33² =

Answer key

  1. 5625
  2. 3025
  3. 961
  4. 5041
  5. 1156
  6. 2304
  7. 2601
  8. 1444
  9. 1225
  10. 3721
  11. 6084
  12. 7056
  13. 3136
  14. 4356
  15. 5776
  16. 8281
  17. 1681
  18. 1369
  19. 3969
  20. 2025
  21. 4624
  22. 9801
  23. 4225
  24. 4096
  25. 4761
  26. 8464
  27. 8649
  28. 5184
  29. 1521
  30. 1936
  31. 9604
  32. 6889
  33. 7921
  34. 9409
  35. 2704
  36. 7396
  37. 2916
  38. 5929
  39. 3481
  40. 1089

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