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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 35 · 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. 1.21² =
  2. 2.71² =
  3. 3.31² =
  4. 4.49² =
  5. 5.59² =
  6. 6.79² =
  7. 7.89² =
  8. 8.51² =
  9. 9.81² =
  10. 10.19² =
  11. 11.89² =
  12. 12.81² =
  13. 13.69² =
  14. 14.81² =
  15. 15.89² =
  16. 16.69² =
  17. 17.71² =
  18. 18.39² =
  19. 19.21² =
  20. 20.69² =
  21. 21.31² =
  22. 22.51² =
  23. 23.29² =
  24. 24.61² =
  25. 25.29² =
  26. 26.29² =
  27. 27.79² =
  28. 28.39² =
  29. 29.21² =
  30. 30.59² =
  31. 31.61² =
  32. 32.81² =
  33. 33.39² =
  34. 34.59² =
  35. 35.39² =
  36. 36.21² =
  37. 37.69² =
  38. 38.69² =
  39. 39.71² =
  40. 40.31² =

Answer key

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

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