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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 200 · 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. 1.81² =
  2. 2.49² =
  3. 3.39² =
  4. 4.39² =
  5. 5.39² =
  6. 6.29² =
  7. 7.81² =
  8. 8.69² =
  9. 9.49² =
  10. 10.79² =
  11. 11.89² =
  12. 12.39² =
  13. 13.39² =
  14. 14.21² =
  15. 15.39² =
  16. 16.51² =
  17. 17.81² =
  18. 18.49² =
  19. 19.49² =
  20. 20.59² =
  21. 21.49² =
  22. 22.61² =
  23. 23.21² =
  24. 24.59² =
  25. 25.89² =
  26. 26.21² =
  27. 27.39² =
  28. 28.49² =
  29. 29.39² =
  30. 30.19² =
  31. 31.69² =
  32. 32.81² =
  33. 33.61² =
  34. 34.31² =
  35. 35.61² =
  36. 36.71² =
  37. 37.19² =
  38. 38.61² =
  39. 39.79² =
  40. 40.31² =

Answer key

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

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