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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 853 · 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. 1.97² =
  2. 2.49² =
  3. 3.43² =
  4. 4.51² =
  5. 5.67² =
  6. 6.98² =
  7. 7.34² =
  8. 8.41² =
  9. 9.86² =
  10. 10.32² =
  11. 11.38² =
  12. 12.78² =
  13. 13.39² =
  14. 14.71² =
  15. 15.88² =
  16. 16.33² =
  17. 17.73² =
  18. 18.81² =
  19. 19.91² =
  20. 20.36² =
  21. 21.65² =
  22. 22.61² =
  23. 23.72² =
  24. 24.56² =
  25. 25.46² =
  26. 26.52² =
  27. 27.57² =
  28. 28.68² =
  29. 29.76² =
  30. 30.47² =
  31. 31.99² =
  32. 32.69² =
  33. 33.87² =
  34. 34.79² =
  35. 35.37² =
  36. 36.66² =
  37. 37.35² =
  38. 38.59² =
  39. 39.89² =
  40. 40.93² =

Answer key

  1. 9409
  2. 2401
  3. 1849
  4. 2601
  5. 4489
  6. 9604
  7. 1156
  8. 1681
  9. 7396
  10. 1024
  11. 1444
  12. 6084
  13. 1521
  14. 5041
  15. 7744
  16. 1089
  17. 5329
  18. 6561
  19. 8281
  20. 1296
  21. 4225
  22. 3721
  23. 5184
  24. 3136
  25. 2116
  26. 2704
  27. 3249
  28. 4624
  29. 5776
  30. 2209
  31. 9801
  32. 4761
  33. 7569
  34. 6241
  35. 1369
  36. 4356
  37. 1225
  38. 3481
  39. 7921
  40. 8649

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