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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 995 · 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. 1.91² =
  2. 2.98² =
  3. 3.88² =
  4. 4.84² =
  5. 5.49² =
  6. 6.47² =
  7. 7.32² =
  8. 8.57² =
  9. 9.52² =
  10. 10.83² =
  11. 11.35² =
  12. 12.37² =
  13. 13.33² =
  14. 14.75² =
  15. 15.38² =
  16. 16.51² =
  17. 17.74² =
  18. 18.46² =
  19. 19.55² =
  20. 20.48² =
  21. 21.56² =
  22. 22.69² =
  23. 23.41² =
  24. 24.53² =
  25. 25.93² =
  26. 26.72² =
  27. 27.87² =
  28. 28.86² =
  29. 29.96² =
  30. 30.61² =
  31. 31.77² =
  32. 32.81² =
  33. 33.45² =
  34. 34.76² =
  35. 35.31² =
  36. 36.63² =
  37. 37.99² =
  38. 38.58² =
  39. 39.89² =
  40. 40.82² =

Answer key

  1. 8281
  2. 9604
  3. 7744
  4. 7056
  5. 2401
  6. 2209
  7. 1024
  8. 3249
  9. 2704
  10. 6889
  11. 1225
  12. 1369
  13. 1089
  14. 5625
  15. 1444
  16. 2601
  17. 5476
  18. 2116
  19. 3025
  20. 2304
  21. 3136
  22. 4761
  23. 1681
  24. 2809
  25. 8649
  26. 5184
  27. 7569
  28. 7396
  29. 9216
  30. 3721
  31. 5929
  32. 6561
  33. 2025
  34. 5776
  35. 961
  36. 3969
  37. 9801
  38. 3364
  39. 7921
  40. 6724

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