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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 988 · 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. 1.96² =
  2. 2.65² =
  3. 3.43² =
  4. 4.79² =
  5. 5.77² =
  6. 6.94² =
  7. 7.72² =
  8. 8.71² =
  9. 9.89² =
  10. 10.83² =
  11. 11.98² =
  12. 12.48² =
  13. 13.92² =
  14. 14.69² =
  15. 15.97² =
  16. 16.76² =
  17. 17.67² =
  18. 18.61² =
  19. 19.34² =
  20. 20.45² =
  21. 21.62² =
  22. 22.51² =
  23. 23.47² =
  24. 24.58² =
  25. 25.32² =
  26. 26.91² =
  27. 27.55² =
  28. 28.68² =
  29. 29.33² =
  30. 30.85² =
  31. 31.86² =
  32. 32.88² =
  33. 33.41² =
  34. 34.54² =
  35. 35.38² =
  36. 36.56² =
  37. 37.74² =
  38. 38.63² =
  39. 39.87² =
  40. 40.31² =

Answer key

  1. 9216
  2. 4225
  3. 1849
  4. 6241
  5. 5929
  6. 8836
  7. 5184
  8. 5041
  9. 7921
  10. 6889
  11. 9604
  12. 2304
  13. 8464
  14. 4761
  15. 9409
  16. 5776
  17. 4489
  18. 3721
  19. 1156
  20. 2025
  21. 3844
  22. 2601
  23. 2209
  24. 3364
  25. 1024
  26. 8281
  27. 3025
  28. 4624
  29. 1089
  30. 7225
  31. 7396
  32. 7744
  33. 1681
  34. 2916
  35. 1444
  36. 3136
  37. 5476
  38. 3969
  39. 7569
  40. 961

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