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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 323 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.79² =
  2. 2.39² =
  3. 3.21² =
  4. 4.59² =
  5. 5.51² =
  6. 6.91² =
  7. 7.41² =
  8. 8.71² =
  9. 9.29² =
  10. 10.49² =
  11. 11.51² =
  12. 12.49² =
  13. 13.91² =
  14. 14.79² =
  15. 15.51² =
  16. 16.59² =
  17. 17.21² =
  18. 18.81² =
  19. 19.29² =
  20. 20.31² =
  21. 21.61² =
  22. 22.19² =
  23. 23.41² =
  24. 24.39² =
  25. 25.49² =
  26. 26.19² =
  27. 27.69² =
  28. 28.61² =
  29. 29.29² =
  30. 30.89² =
  31. 31.21² =
  32. 32.61² =
  33. 33.79² =
  34. 34.91² =
  35. 35.19² =
  36. 36.61² =
  37. 37.29² =
  38. 38.29² =
  39. 39.21² =
  40. 40.31² =

Answer key

  1. 6241
  2. 1521
  3. 441
  4. 3481
  5. 2601
  6. 8281
  7. 1681
  8. 5041
  9. 841
  10. 2401
  11. 2601
  12. 2401
  13. 8281
  14. 6241
  15. 2601
  16. 3481
  17. 441
  18. 6561
  19. 841
  20. 961
  21. 3721
  22. 361
  23. 1681
  24. 1521
  25. 2401
  26. 361
  27. 4761
  28. 3721
  29. 841
  30. 7921
  31. 441
  32. 3721
  33. 6241
  34. 8281
  35. 361
  36. 3721
  37. 841
  38. 841
  39. 441
  40. 961

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