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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 867 · 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. 1.44² =
  2. 2.91² =
  3. 3.81² =
  4. 4.88² =
  5. 5.82² =
  6. 6.61² =
  7. 7.43² =
  8. 8.35² =
  9. 9.33² =
  10. 10.31² =
  11. 11.62² =
  12. 12.68² =
  13. 13.48² =
  14. 14.72² =
  15. 15.67² =
  16. 16.79² =
  17. 17.76² =
  18. 18.51² =
  19. 19.94² =
  20. 20.63² =
  21. 21.93² =
  22. 22.57² =
  23. 23.95² =
  24. 24.52² =
  25. 25.34² =
  26. 26.89² =
  27. 27.71² =
  28. 28.41² =
  29. 29.56² =
  30. 30.59² =
  31. 31.37² =
  32. 32.47² =
  33. 33.49² =
  34. 34.32² =
  35. 35.64² =
  36. 36.99² =
  37. 37.85² =
  38. 38.38² =
  39. 39.69² =
  40. 40.36² =

Answer key

  1. 1936
  2. 8281
  3. 6561
  4. 7744
  5. 6724
  6. 3721
  7. 1849
  8. 1225
  9. 1089
  10. 961
  11. 3844
  12. 4624
  13. 2304
  14. 5184
  15. 4489
  16. 6241
  17. 5776
  18. 2601
  19. 8836
  20. 3969
  21. 8649
  22. 3249
  23. 9025
  24. 2704
  25. 1156
  26. 7921
  27. 5041
  28. 1681
  29. 3136
  30. 3481
  31. 1369
  32. 2209
  33. 2401
  34. 1024
  35. 4096
  36. 9801
  37. 7225
  38. 1444
  39. 4761
  40. 1296

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