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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 90 · 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. 1.49² =
  2. 2.21² =
  3. 3.49² =
  4. 4.79² =
  5. 5.81² =
  6. 6.39² =
  7. 7.39² =
  8. 8.59² =
  9. 9.39² =
  10. 10.39² =
  11. 11.51² =
  12. 12.39² =
  13. 13.59² =
  14. 14.69² =
  15. 15.59² =
  16. 16.31² =
  17. 17.31² =
  18. 18.29² =
  19. 19.61² =
  20. 20.51² =
  21. 21.69² =
  22. 22.41² =
  23. 23.69² =
  24. 24.81² =
  25. 25.59² =
  26. 26.29² =
  27. 27.89² =
  28. 28.29² =
  29. 29.71² =
  30. 30.51² =
  31. 31.71² =
  32. 32.89² =
  33. 33.31² =
  34. 34.81² =
  35. 35.51² =
  36. 36.19² =
  37. 37.59² =
  38. 38.69² =
  39. 39.81² =
  40. 40.59² =

Answer key

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

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