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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 951 · 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. 1.55² =
  2. 2.61² =
  3. 3.91² =
  4. 4.71² =
  5. 5.45² =
  6. 6.96² =
  7. 7.68² =
  8. 8.43² =
  9. 9.79² =
  10. 10.31² =
  11. 11.54² =
  12. 12.36² =
  13. 13.64² =
  14. 14.89² =
  15. 15.62² =
  16. 16.67² =
  17. 17.38² =
  18. 18.85² =
  19. 19.81² =
  20. 20.74² =
  21. 21.59² =
  22. 22.73² =
  23. 23.47² =
  24. 24.46² =
  25. 25.41² =
  26. 26.32² =
  27. 27.95² =
  28. 28.63² =
  29. 29.51² =
  30. 30.78² =
  31. 31.75² =
  32. 32.72² =
  33. 33.48² =
  34. 34.53² =
  35. 35.35² =
  36. 36.44² =
  37. 37.92² =
  38. 38.37² =
  39. 39.34² =
  40. 40.88² =

Answer key

  1. 3025
  2. 3721
  3. 8281
  4. 5041
  5. 2025
  6. 9216
  7. 4624
  8. 1849
  9. 6241
  10. 961
  11. 2916
  12. 1296
  13. 4096
  14. 7921
  15. 3844
  16. 4489
  17. 1444
  18. 7225
  19. 6561
  20. 5476
  21. 3481
  22. 5329
  23. 2209
  24. 2116
  25. 1681
  26. 1024
  27. 9025
  28. 3969
  29. 2601
  30. 6084
  31. 5625
  32. 5184
  33. 2304
  34. 2809
  35. 1225
  36. 1936
  37. 8464
  38. 1369
  39. 1156
  40. 7744

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