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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 986 · 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. 1.79² =
  2. 2.74² =
  3. 3.49² =
  4. 4.46² =
  5. 5.98² =
  6. 6.69² =
  7. 7.99² =
  8. 8.35² =
  9. 9.41² =
  10. 10.83² =
  11. 11.66² =
  12. 12.71² =
  13. 13.59² =
  14. 14.53² =
  15. 15.34² =
  16. 16.52² =
  17. 17.92² =
  18. 18.81² =
  19. 19.86² =
  20. 20.65² =
  21. 21.38² =
  22. 22.51² =
  23. 23.63² =
  24. 24.39² =
  25. 25.84² =
  26. 26.44² =
  27. 27.82² =
  28. 28.72² =
  29. 29.91² =
  30. 30.31² =
  31. 31.95² =
  32. 32.93² =
  33. 33.54² =
  34. 34.37² =
  35. 35.55² =
  36. 36.42² =
  37. 37.94² =
  38. 38.58² =
  39. 39.61² =
  40. 40.75² =

Answer key

  1. 6241
  2. 5476
  3. 2401
  4. 2116
  5. 9604
  6. 4761
  7. 9801
  8. 1225
  9. 1681
  10. 6889
  11. 4356
  12. 5041
  13. 3481
  14. 2809
  15. 1156
  16. 2704
  17. 8464
  18. 6561
  19. 7396
  20. 4225
  21. 1444
  22. 2601
  23. 3969
  24. 1521
  25. 7056
  26. 1936
  27. 6724
  28. 5184
  29. 8281
  30. 961
  31. 9025
  32. 8649
  33. 2916
  34. 1369
  35. 3025
  36. 1764
  37. 8836
  38. 3364
  39. 3721
  40. 5625

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