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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 874 · 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. 1.32² =
  2. 2.76² =
  3. 3.77² =
  4. 4.61² =
  5. 5.89² =
  6. 6.75² =
  7. 7.67² =
  8. 8.52² =
  9. 9.91² =
  10. 10.82² =
  11. 11.83² =
  12. 12.51² =
  13. 13.95² =
  14. 14.54² =
  15. 15.72² =
  16. 16.53² =
  17. 17.41² =
  18. 18.43² =
  19. 19.38² =
  20. 20.78² =
  21. 21.48² =
  22. 22.98² =
  23. 23.79² =
  24. 24.42² =
  25. 25.44² =
  26. 26.35² =
  27. 27.93² =
  28. 28.88² =
  29. 29.86² =
  30. 30.33² =
  31. 31.36² =
  32. 32.58² =
  33. 33.39² =
  34. 34.64² =
  35. 35.68² =
  36. 36.66² =
  37. 37.74² =
  38. 38.99² =
  39. 39.94² =
  40. 40.46² =

Answer key

  1. 1024
  2. 5776
  3. 5929
  4. 3721
  5. 7921
  6. 5625
  7. 4489
  8. 2704
  9. 8281
  10. 6724
  11. 6889
  12. 2601
  13. 9025
  14. 2916
  15. 5184
  16. 2809
  17. 1681
  18. 1849
  19. 1444
  20. 6084
  21. 2304
  22. 9604
  23. 6241
  24. 1764
  25. 1936
  26. 1225
  27. 8649
  28. 7744
  29. 7396
  30. 1089
  31. 1296
  32. 3364
  33. 1521
  34. 4096
  35. 4624
  36. 4356
  37. 5476
  38. 9801
  39. 8836
  40. 2116

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