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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 870 · 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. 1.34² =
  2. 2.98² =
  3. 3.57² =
  4. 4.48² =
  5. 5.67² =
  6. 6.43² =
  7. 7.69² =
  8. 8.81² =
  9. 9.75² =
  10. 10.35² =
  11. 11.68² =
  12. 12.51² =
  13. 13.33² =
  14. 14.55² =
  15. 15.37² =
  16. 16.44² =
  17. 17.72² =
  18. 18.83² =
  19. 19.91² =
  20. 20.99² =
  21. 21.52² =
  22. 22.49² =
  23. 23.88² =
  24. 24.94² =
  25. 25.58² =
  26. 26.92² =
  27. 27.36² =
  28. 28.62² =
  29. 29.82² =
  30. 30.97² =
  31. 31.86² =
  32. 32.59² =
  33. 33.32² =
  34. 34.66² =
  35. 35.47² =
  36. 36.76² =
  37. 37.93² =
  38. 38.31² =
  39. 39.85² =
  40. 40.64² =

Answer key

  1. 1156
  2. 9604
  3. 3249
  4. 2304
  5. 4489
  6. 1849
  7. 4761
  8. 6561
  9. 5625
  10. 1225
  11. 4624
  12. 2601
  13. 1089
  14. 3025
  15. 1369
  16. 1936
  17. 5184
  18. 6889
  19. 8281
  20. 9801
  21. 2704
  22. 2401
  23. 7744
  24. 8836
  25. 3364
  26. 8464
  27. 1296
  28. 3844
  29. 6724
  30. 9409
  31. 7396
  32. 3481
  33. 1024
  34. 4356
  35. 2209
  36. 5776
  37. 8649
  38. 961
  39. 7225
  40. 4096

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