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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 854 · 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. 2.97² =
  3. 3.72² =
  4. 4.61² =
  5. 5.95² =
  6. 6.41² =
  7. 7.94² =
  8. 8.31² =
  9. 9.81² =
  10. 10.93² =
  11. 11.42² =
  12. 12.66² =
  13. 13.53² =
  14. 14.55² =
  15. 15.67² =
  16. 16.75² =
  17. 17.79² =
  18. 18.85² =
  19. 19.64² =
  20. 20.74² =
  21. 21.69² =
  22. 22.37² =
  23. 23.88² =
  24. 24.36² =
  25. 25.71² =
  26. 26.52² =
  27. 27.76² =
  28. 28.35² =
  29. 29.49² =
  30. 30.98² =
  31. 31.63² =
  32. 32.32² =
  33. 33.48² =
  34. 34.83² =
  35. 35.45² =
  36. 36.89² =
  37. 37.87² =
  38. 38.51² =
  39. 39.82² =
  40. 40.65² =

Answer key

  1. 9216
  2. 9409
  3. 5184
  4. 3721
  5. 9025
  6. 1681
  7. 8836
  8. 961
  9. 6561
  10. 8649
  11. 1764
  12. 4356
  13. 2809
  14. 3025
  15. 4489
  16. 5625
  17. 6241
  18. 7225
  19. 4096
  20. 5476
  21. 4761
  22. 1369
  23. 7744
  24. 1296
  25. 5041
  26. 2704
  27. 5776
  28. 1225
  29. 2401
  30. 9604
  31. 3969
  32. 1024
  33. 2304
  34. 6889
  35. 2025
  36. 7921
  37. 7569
  38. 2601
  39. 6724
  40. 4225

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