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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 856 · 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. 1.31² =
  2. 2.35² =
  3. 3.88² =
  4. 4.81² =
  5. 5.91² =
  6. 6.44² =
  7. 7.61² =
  8. 8.33² =
  9. 9.51² =
  10. 10.42² =
  11. 11.56² =
  12. 12.37² =
  13. 13.55² =
  14. 14.54² =
  15. 15.93² =
  16. 16.68² =
  17. 17.96² =
  18. 18.82² =
  19. 19.52² =
  20. 20.98² =
  21. 21.87² =
  22. 22.89² =
  23. 23.76² =
  24. 24.48² =
  25. 25.39² =
  26. 26.45² =
  27. 27.41² =
  28. 28.79² =
  29. 29.78² =
  30. 30.92² =
  31. 31.85² =
  32. 32.72² =
  33. 33.65² =
  34. 34.71² =
  35. 35.57² =
  36. 36.75² =
  37. 37.66² =
  38. 38.95² =
  39. 39.94² =
  40. 40.49² =

Answer key

  1. 961
  2. 1225
  3. 7744
  4. 6561
  5. 8281
  6. 1936
  7. 3721
  8. 1089
  9. 2601
  10. 1764
  11. 3136
  12. 1369
  13. 3025
  14. 2916
  15. 8649
  16. 4624
  17. 9216
  18. 6724
  19. 2704
  20. 9604
  21. 7569
  22. 7921
  23. 5776
  24. 2304
  25. 1521
  26. 2025
  27. 1681
  28. 6241
  29. 6084
  30. 8464
  31. 7225
  32. 5184
  33. 4225
  34. 5041
  35. 3249
  36. 5625
  37. 4356
  38. 9025
  39. 8836
  40. 2401

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