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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 859 · 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. 1.51² =
  2. 2.57² =
  3. 3.42² =
  4. 4.41² =
  5. 5.52² =
  6. 6.77² =
  7. 7.95² =
  8. 8.53² =
  9. 9.78² =
  10. 10.92² =
  11. 11.45² =
  12. 12.71² =
  13. 13.66² =
  14. 14.55² =
  15. 15.67² =
  16. 16.39² =
  17. 17.73² =
  18. 18.43² =
  19. 19.84² =
  20. 20.88² =
  21. 21.72² =
  22. 22.61² =
  23. 23.74² =
  24. 24.81² =
  25. 25.76² =
  26. 26.58² =
  27. 27.75² =
  28. 28.34² =
  29. 29.98² =
  30. 30.36² =
  31. 31.63² =
  32. 32.33² =
  33. 33.91² =
  34. 34.82² =
  35. 35.47² =
  36. 36.56² =
  37. 37.31² =
  38. 38.64² =
  39. 39.62² =
  40. 40.48² =

Answer key

  1. 2601
  2. 3249
  3. 1764
  4. 1681
  5. 2704
  6. 5929
  7. 9025
  8. 2809
  9. 6084
  10. 8464
  11. 2025
  12. 5041
  13. 4356
  14. 3025
  15. 4489
  16. 1521
  17. 5329
  18. 1849
  19. 7056
  20. 7744
  21. 5184
  22. 3721
  23. 5476
  24. 6561
  25. 5776
  26. 3364
  27. 5625
  28. 1156
  29. 9604
  30. 1296
  31. 3969
  32. 1089
  33. 8281
  34. 6724
  35. 2209
  36. 3136
  37. 961
  38. 4096
  39. 3844
  40. 2304

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