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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 446 · 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. 1.39² =
  2. 2.81² =
  3. 3.79² =
  4. 4.89² =
  5. 5.71² =
  6. 6.49² =
  7. 7.71² =
  8. 8.29² =
  9. 9.81² =
  10. 10.71² =
  11. 11.39² =
  12. 12.89² =
  13. 13.79² =
  14. 14.61² =
  15. 15.89² =
  16. 16.69² =
  17. 17.71² =
  18. 18.29² =
  19. 19.69² =
  20. 20.69² =
  21. 21.61² =
  22. 22.31² =
  23. 23.81² =
  24. 24.81² =
  25. 25.29² =
  26. 26.59² =
  27. 27.29² =
  28. 28.51² =
  29. 29.79² =
  30. 30.19² =
  31. 31.69² =
  32. 32.81² =
  33. 33.69² =
  34. 34.59² =
  35. 35.69² =
  36. 36.51² =
  37. 37.61² =
  38. 38.29² =
  39. 39.91² =
  40. 40.81² =

Answer key

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

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