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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 932 · 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. 1.58² =
  2. 2.31² =
  3. 3.71² =
  4. 4.82² =
  5. 5.34² =
  6. 6.88² =
  7. 7.81² =
  8. 8.94² =
  9. 9.41² =
  10. 10.47² =
  11. 11.68² =
  12. 12.91² =
  13. 13.69² =
  14. 14.49² =
  15. 15.63² =
  16. 16.32² =
  17. 17.51² =
  18. 18.92² =
  19. 19.95² =
  20. 20.99² =
  21. 21.93² =
  22. 22.38² =
  23. 23.45² =
  24. 24.48² =
  25. 25.89² =
  26. 26.44² =
  27. 27.35² =
  28. 28.54² =
  29. 29.66² =
  30. 30.61² =
  31. 31.87² =
  32. 32.65² =
  33. 33.36² =
  34. 34.33² =
  35. 35.75² =
  36. 36.97² =
  37. 37.52² =
  38. 38.79² =
  39. 39.46² =
  40. 40.72² =

Answer key

  1. 3364
  2. 961
  3. 5041
  4. 6724
  5. 1156
  6. 7744
  7. 6561
  8. 8836
  9. 1681
  10. 2209
  11. 4624
  12. 8281
  13. 4761
  14. 2401
  15. 3969
  16. 1024
  17. 2601
  18. 8464
  19. 9025
  20. 9801
  21. 8649
  22. 1444
  23. 2025
  24. 2304
  25. 7921
  26. 1936
  27. 1225
  28. 2916
  29. 4356
  30. 3721
  31. 7569
  32. 4225
  33. 1296
  34. 1089
  35. 5625
  36. 9409
  37. 2704
  38. 6241
  39. 2116
  40. 5184

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