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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 983 · 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. 1.61² =
  2. 2.81² =
  3. 3.42² =
  4. 4.35² =
  5. 5.75² =
  6. 6.71² =
  7. 7.43² =
  8. 8.91² =
  9. 9.56² =
  10. 10.36² =
  11. 11.38² =
  12. 12.39² =
  13. 13.93² =
  14. 14.66² =
  15. 15.59² =
  16. 16.51² =
  17. 17.34² =
  18. 18.89² =
  19. 19.74² =
  20. 20.86² =
  21. 21.63² =
  22. 22.64² =
  23. 23.85² =
  24. 24.46² =
  25. 25.49² =
  26. 26.55² =
  27. 27.54² =
  28. 28.37² =
  29. 29.67² =
  30. 30.33² =
  31. 31.83² =
  32. 32.45² =
  33. 33.48² =
  34. 34.62² =
  35. 35.41² =
  36. 36.92² =
  37. 37.32² =
  38. 38.95² =
  39. 39.71² =
  40. 40.79² =

Answer key

  1. 3721
  2. 6561
  3. 1764
  4. 1225
  5. 5625
  6. 5041
  7. 1849
  8. 8281
  9. 3136
  10. 1296
  11. 1444
  12. 1521
  13. 8649
  14. 4356
  15. 3481
  16. 2601
  17. 1156
  18. 7921
  19. 5476
  20. 7396
  21. 3969
  22. 4096
  23. 7225
  24. 2116
  25. 2401
  26. 3025
  27. 2916
  28. 1369
  29. 4489
  30. 1089
  31. 6889
  32. 2025
  33. 2304
  34. 3844
  35. 1681
  36. 8464
  37. 1024
  38. 9025
  39. 5041
  40. 6241

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