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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 860 · 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. 1.31² =
  2. 2.79² =
  3. 3.44² =
  4. 4.43² =
  5. 5.48² =
  6. 6.83² =
  7. 7.54² =
  8. 8.61² =
  9. 9.91² =
  10. 10.45² =
  11. 11.77² =
  12. 12.76² =
  13. 13.51² =
  14. 14.64² =
  15. 15.95² =
  16. 16.56² =
  17. 17.78² =
  18. 18.81² =
  19. 19.89² =
  20. 20.85² =
  21. 21.38² =
  22. 22.93² =
  23. 23.97² =
  24. 24.66² =
  25. 25.34² =
  26. 26.86² =
  27. 27.82² =
  28. 28.69² =
  29. 29.71² =
  30. 30.72² =
  31. 31.68² =
  32. 32.74² =
  33. 33.63² =
  34. 34.52² =
  35. 35.58² =
  36. 36.96² =
  37. 37.32² =
  38. 38.37² =
  39. 39.53² =
  40. 40.39² =

Answer key

  1. 961
  2. 6241
  3. 1936
  4. 1849
  5. 2304
  6. 6889
  7. 2916
  8. 3721
  9. 8281
  10. 2025
  11. 5929
  12. 5776
  13. 2601
  14. 4096
  15. 9025
  16. 3136
  17. 6084
  18. 6561
  19. 7921
  20. 7225
  21. 1444
  22. 8649
  23. 9409
  24. 4356
  25. 1156
  26. 7396
  27. 6724
  28. 4761
  29. 5041
  30. 5184
  31. 4624
  32. 5476
  33. 3969
  34. 2704
  35. 3364
  36. 9216
  37. 1024
  38. 1369
  39. 2809
  40. 1521

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