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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 877 · 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. 1.94² =
  2. 2.71² =
  3. 3.49² =
  4. 4.36² =
  5. 5.98² =
  6. 6.52² =
  7. 7.33² =
  8. 8.38² =
  9. 9.46² =
  10. 10.43² =
  11. 11.78² =
  12. 12.56² =
  13. 13.93² =
  14. 14.41² =
  15. 15.81² =
  16. 16.48² =
  17. 17.88² =
  18. 18.87² =
  19. 19.35² =
  20. 20.69² =
  21. 21.83² =
  22. 22.31² =
  23. 23.79² =
  24. 24.74² =
  25. 25.65² =
  26. 26.61² =
  27. 27.54² =
  28. 28.76² =
  29. 29.55² =
  30. 30.58² =
  31. 31.64² =
  32. 32.37² =
  33. 33.92² =
  34. 34.89² =
  35. 35.66² =
  36. 36.32² =
  37. 37.44² =
  38. 38.57² =
  39. 39.53² =
  40. 40.39² =

Answer key

  1. 8836
  2. 5041
  3. 2401
  4. 1296
  5. 9604
  6. 2704
  7. 1089
  8. 1444
  9. 2116
  10. 1849
  11. 6084
  12. 3136
  13. 8649
  14. 1681
  15. 6561
  16. 2304
  17. 7744
  18. 7569
  19. 1225
  20. 4761
  21. 6889
  22. 961
  23. 6241
  24. 5476
  25. 4225
  26. 3721
  27. 2916
  28. 5776
  29. 3025
  30. 3364
  31. 4096
  32. 1369
  33. 8464
  34. 7921
  35. 4356
  36. 1024
  37. 1936
  38. 3249
  39. 2809
  40. 1521

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