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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 889 · 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. 1.49² =
  2. 2.34² =
  3. 3.45² =
  4. 4.69² =
  5. 5.79² =
  6. 6.47² =
  7. 7.39² =
  8. 8.72² =
  9. 9.56² =
  10. 10.54² =
  11. 11.98² =
  12. 12.67² =
  13. 13.95² =
  14. 14.94² =
  15. 15.33² =
  16. 16.61² =
  17. 17.42² =
  18. 18.41² =
  19. 19.86² =
  20. 20.91² =
  21. 21.59² =
  22. 22.44² =
  23. 23.62² =
  24. 24.43² =
  25. 25.82² =
  26. 26.53² =
  27. 27.48² =
  28. 28.71² =
  29. 29.99² =
  30. 30.63² =
  31. 31.64² =
  32. 32.31² =
  33. 33.89² =
  34. 34.51² =
  35. 35.46² =
  36. 36.38² =
  37. 37.83² =
  38. 38.93² =
  39. 39.55² =
  40. 40.85² =

Answer key

  1. 2401
  2. 1156
  3. 2025
  4. 4761
  5. 6241
  6. 2209
  7. 1521
  8. 5184
  9. 3136
  10. 2916
  11. 9604
  12. 4489
  13. 9025
  14. 8836
  15. 1089
  16. 3721
  17. 1764
  18. 1681
  19. 7396
  20. 8281
  21. 3481
  22. 1936
  23. 3844
  24. 1849
  25. 6724
  26. 2809
  27. 2304
  28. 5041
  29. 9801
  30. 3969
  31. 4096
  32. 961
  33. 7921
  34. 2601
  35. 2116
  36. 1444
  37. 6889
  38. 8649
  39. 3025
  40. 7225

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