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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 886 · 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. 2.33² =
  3. 3.41² =
  4. 4.48² =
  5. 5.32² =
  6. 6.61² =
  7. 7.62² =
  8. 8.66² =
  9. 9.45² =
  10. 10.99² =
  11. 11.84² =
  12. 12.64² =
  13. 13.85² =
  14. 14.35² =
  15. 15.91² =
  16. 16.77² =
  17. 17.55² =
  18. 18.98² =
  19. 19.47² =
  20. 20.59² =
  21. 21.71² =
  22. 22.31² =
  23. 23.51² =
  24. 24.49² =
  25. 25.79² =
  26. 26.96² =
  27. 27.37² =
  28. 28.44² =
  29. 29.82² =
  30. 30.69² =
  31. 31.86² =
  32. 32.88² =
  33. 33.52² =
  34. 34.57² =
  35. 35.65² =
  36. 36.75² =
  37. 37.81² =
  38. 38.87² =
  39. 39.56² =
  40. 40.39² =

Answer key

  1. 5776
  2. 1089
  3. 1681
  4. 2304
  5. 1024
  6. 3721
  7. 3844
  8. 4356
  9. 2025
  10. 9801
  11. 7056
  12. 4096
  13. 7225
  14. 1225
  15. 8281
  16. 5929
  17. 3025
  18. 9604
  19. 2209
  20. 3481
  21. 5041
  22. 961
  23. 2601
  24. 2401
  25. 6241
  26. 9216
  27. 1369
  28. 1936
  29. 6724
  30. 4761
  31. 7396
  32. 7744
  33. 2704
  34. 3249
  35. 4225
  36. 5625
  37. 6561
  38. 7569
  39. 3136
  40. 1521

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