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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 947 · 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. 1.78² =
  2. 2.64² =
  3. 3.58² =
  4. 4.49² =
  5. 5.76² =
  6. 6.74² =
  7. 7.41² =
  8. 8.44² =
  9. 9.35² =
  10. 10.84² =
  11. 11.55² =
  12. 12.91² =
  13. 13.32² =
  14. 14.93² =
  15. 15.46² =
  16. 16.36² =
  17. 17.63² =
  18. 18.51² =
  19. 19.45² =
  20. 20.86² =
  21. 21.73² =
  22. 22.85² =
  23. 23.94² =
  24. 24.92² =
  25. 25.95² =
  26. 26.54² =
  27. 27.97² =
  28. 28.89² =
  29. 29.71² =
  30. 30.68² =
  31. 31.48² =
  32. 32.61² =
  33. 33.43² =
  34. 34.79² =
  35. 35.33² =
  36. 36.82² =
  37. 37.62² =
  38. 38.99² =
  39. 39.69² =
  40. 40.88² =

Answer key

  1. 6084
  2. 4096
  3. 3364
  4. 2401
  5. 5776
  6. 5476
  7. 1681
  8. 1936
  9. 1225
  10. 7056
  11. 3025
  12. 8281
  13. 1024
  14. 8649
  15. 2116
  16. 1296
  17. 3969
  18. 2601
  19. 2025
  20. 7396
  21. 5329
  22. 7225
  23. 8836
  24. 8464
  25. 9025
  26. 2916
  27. 9409
  28. 7921
  29. 5041
  30. 4624
  31. 2304
  32. 3721
  33. 1849
  34. 6241
  35. 1089
  36. 6724
  37. 3844
  38. 9801
  39. 4761
  40. 7744

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