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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 993 · 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. 1.41² =
  2. 2.82² =
  3. 3.78² =
  4. 4.33² =
  5. 5.46² =
  6. 6.42² =
  7. 7.88² =
  8. 8.56² =
  9. 9.67² =
  10. 10.99² =
  11. 11.57² =
  12. 12.61² =
  13. 13.91² =
  14. 14.71² =
  15. 15.76² =
  16. 16.84² =
  17. 17.66² =
  18. 18.74² =
  19. 19.95² =
  20. 20.51² =
  21. 21.79² =
  22. 22.94² =
  23. 23.92² =
  24. 24.54² =
  25. 25.64² =
  26. 26.34² =
  27. 27.49² =
  28. 28.58² =
  29. 29.63² =
  30. 30.89² =
  31. 31.81² =
  32. 32.31² =
  33. 33.47² =
  34. 34.83² =
  35. 35.69² =
  36. 36.43² =
  37. 37.45² =
  38. 38.77² =
  39. 39.97² =
  40. 40.87² =

Answer key

  1. 1681
  2. 6724
  3. 6084
  4. 1089
  5. 2116
  6. 1764
  7. 7744
  8. 3136
  9. 4489
  10. 9801
  11. 3249
  12. 3721
  13. 8281
  14. 5041
  15. 5776
  16. 7056
  17. 4356
  18. 5476
  19. 9025
  20. 2601
  21. 6241
  22. 8836
  23. 8464
  24. 2916
  25. 4096
  26. 1156
  27. 2401
  28. 3364
  29. 3969
  30. 7921
  31. 6561
  32. 961
  33. 2209
  34. 6889
  35. 4761
  36. 1849
  37. 2025
  38. 5929
  39. 9409
  40. 7569

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