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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 456 · 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. 3.69² =
  4. 4.31² =
  5. 5.89² =
  6. 6.49² =
  7. 7.59² =
  8. 8.69² =
  9. 9.61² =
  10. 10.39² =
  11. 11.59² =
  12. 12.51² =
  13. 13.19² =
  14. 14.51² =
  15. 15.89² =
  16. 16.69² =
  17. 17.79² =
  18. 18.81² =
  19. 19.79² =
  20. 20.59² =
  21. 21.59² =
  22. 22.21² =
  23. 23.59² =
  24. 24.39² =
  25. 25.19² =
  26. 26.31² =
  27. 27.51² =
  28. 28.89² =
  29. 29.21² =
  30. 30.89² =
  31. 31.79² =
  32. 32.29² =
  33. 33.19² =
  34. 34.71² =
  35. 35.39² =
  36. 36.81² =
  37. 37.41² =
  38. 38.19² =
  39. 39.19² =
  40. 40.69² =

Answer key

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

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