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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 289 · 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. 1.76² =
  2. 2.56² =
  3. 3.61² =
  4. 4.84² =
  5. 5.95² =
  6. 6.44² =
  7. 7.97² =
  8. 8.85² =
  9. 9.31² =
  10. 10.33² =
  11. 11.41² =
  12. 12.58² =
  13. 13.82² =
  14. 14.39² =
  15. 15.77² =
  16. 16.71² =
  17. 17.57² =
  18. 18.34² =
  19. 19.64² =
  20. 20.88² =
  21. 21.66² =
  22. 22.86² =
  23. 23.89² =
  24. 24.52² =
  25. 25.79² =
  26. 26.69² =
  27. 27.51² =
  28. 28.59² =
  29. 29.42² =
  30. 30.32² =
  31. 31.45² =
  32. 32.87² =
  33. 33.54² =
  34. 34.62² =
  35. 35.74² =
  36. 36.96² =
  37. 37.72² =
  38. 38.55² =
  39. 39.68² =
  40. 40.38² =

Answer key

  1. 5776
  2. 3136
  3. 3721
  4. 7056
  5. 9025
  6. 1936
  7. 9409
  8. 7225
  9. 961
  10. 1089
  11. 1681
  12. 3364
  13. 6724
  14. 1521
  15. 5929
  16. 5041
  17. 3249
  18. 1156
  19. 4096
  20. 7744
  21. 4356
  22. 7396
  23. 7921
  24. 2704
  25. 6241
  26. 4761
  27. 2601
  28. 3481
  29. 1764
  30. 1024
  31. 2025
  32. 7569
  33. 2916
  34. 3844
  35. 5476
  36. 9216
  37. 5184
  38. 3025
  39. 4624
  40. 1444

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