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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 919 · 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. 1.71² =
  2. 2.81² =
  3. 3.87² =
  4. 4.44² =
  5. 5.82² =
  6. 6.99² =
  7. 7.92² =
  8. 8.55² =
  9. 9.42² =
  10. 10.59² =
  11. 11.83² =
  12. 12.47² =
  13. 13.96² =
  14. 14.91² =
  15. 15.51² =
  16. 16.45² =
  17. 17.88² =
  18. 18.53² =
  19. 19.98² =
  20. 20.75² =
  21. 21.33² =
  22. 22.39² =
  23. 23.62² =
  24. 24.37² =
  25. 25.43² =
  26. 26.36² =
  27. 27.72² =
  28. 28.34² =
  29. 29.69² =
  30. 30.65² =
  31. 31.89² =
  32. 32.31² =
  33. 33.66² =
  34. 34.85² =
  35. 35.94² =
  36. 36.46² =
  37. 37.57² =
  38. 38.76² =
  39. 39.61² =
  40. 40.67² =

Answer key

  1. 5041
  2. 6561
  3. 7569
  4. 1936
  5. 6724
  6. 9801
  7. 8464
  8. 3025
  9. 1764
  10. 3481
  11. 6889
  12. 2209
  13. 9216
  14. 8281
  15. 2601
  16. 2025
  17. 7744
  18. 2809
  19. 9604
  20. 5625
  21. 1089
  22. 1521
  23. 3844
  24. 1369
  25. 1849
  26. 1296
  27. 5184
  28. 1156
  29. 4761
  30. 4225
  31. 7921
  32. 961
  33. 4356
  34. 7225
  35. 8836
  36. 2116
  37. 3249
  38. 5776
  39. 3721
  40. 4489

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