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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 830 · 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. 1.85² =
  2. 2.61² =
  3. 3.79² =
  4. 4.51² =
  5. 5.55² =
  6. 6.58² =
  7. 7.73² =
  8. 8.99² =
  9. 9.87² =
  10. 10.78² =
  11. 11.83² =
  12. 12.41² =
  13. 13.89² =
  14. 14.66² =
  15. 15.75² =
  16. 16.33² =
  17. 17.38² =
  18. 18.69² =
  19. 19.71² =
  20. 20.56² =
  21. 21.81² =
  22. 22.37² =
  23. 23.94² =
  24. 24.84² =
  25. 25.77² =
  26. 26.67² =
  27. 27.43² =
  28. 28.91² =
  29. 29.45² =
  30. 30.39² =
  31. 31.59² =
  32. 32.34² =
  33. 33.64² =
  34. 34.53² =
  35. 35.95² =
  36. 36.63² =
  37. 37.86² =
  38. 38.62² =
  39. 39.74² =
  40. 40.48² =

Answer key

  1. 7225
  2. 3721
  3. 6241
  4. 2601
  5. 3025
  6. 3364
  7. 5329
  8. 9801
  9. 7569
  10. 6084
  11. 6889
  12. 1681
  13. 7921
  14. 4356
  15. 5625
  16. 1089
  17. 1444
  18. 4761
  19. 5041
  20. 3136
  21. 6561
  22. 1369
  23. 8836
  24. 7056
  25. 5929
  26. 4489
  27. 1849
  28. 8281
  29. 2025
  30. 1521
  31. 3481
  32. 1156
  33. 4096
  34. 2809
  35. 9025
  36. 3969
  37. 7396
  38. 3844
  39. 5476
  40. 2304

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