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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 614 · 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. 2.89² =
  3. 3.29² =
  4. 4.89² =
  5. 5.21² =
  6. 6.51² =
  7. 7.29² =
  8. 8.19² =
  9. 9.49² =
  10. 10.61² =
  11. 11.69² =
  12. 12.79² =
  13. 13.51² =
  14. 14.29² =
  15. 15.61² =
  16. 16.19² =
  17. 17.61² =
  18. 18.69² =
  19. 19.21² =
  20. 20.71² =
  21. 21.71² =
  22. 22.59² =
  23. 23.19² =
  24. 24.39² =
  25. 25.21² =
  26. 26.79² =
  27. 27.89² =
  28. 28.29² =
  29. 29.81² =
  30. 30.39² =
  31. 31.19² =
  32. 32.39² =
  33. 33.61² =
  34. 34.49² =
  35. 35.51² =
  36. 36.31² =
  37. 37.21² =
  38. 38.31² =
  39. 39.61² =
  40. 40.21² =

Answer key

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

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