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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 675 · 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. 1.19² =
  2. 2.59² =
  3. 3.69² =
  4. 4.29² =
  5. 5.89² =
  6. 6.61² =
  7. 7.29² =
  8. 8.69² =
  9. 9.59² =
  10. 10.39² =
  11. 11.69² =
  12. 12.69² =
  13. 13.19² =
  14. 14.79² =
  15. 15.59² =
  16. 16.49² =
  17. 17.19² =
  18. 18.79² =
  19. 19.89² =
  20. 20.79² =
  21. 21.79² =
  22. 22.61² =
  23. 23.29² =
  24. 24.51² =
  25. 25.61² =
  26. 26.69² =
  27. 27.19² =
  28. 28.29² =
  29. 29.59² =
  30. 30.21² =
  31. 31.31² =
  32. 32.69² =
  33. 33.91² =
  34. 34.19² =
  35. 35.49² =
  36. 36.51² =
  37. 37.91² =
  38. 38.21² =
  39. 39.79² =
  40. 40.31² =

Answer key

  1. 361
  2. 3481
  3. 4761
  4. 841
  5. 7921
  6. 3721
  7. 841
  8. 4761
  9. 3481
  10. 1521
  11. 4761
  12. 4761
  13. 361
  14. 6241
  15. 3481
  16. 2401
  17. 361
  18. 6241
  19. 7921
  20. 6241
  21. 6241
  22. 3721
  23. 841
  24. 2601
  25. 3721
  26. 4761
  27. 361
  28. 841
  29. 3481
  30. 441
  31. 961
  32. 4761
  33. 8281
  34. 361
  35. 2401
  36. 2601
  37. 8281
  38. 441
  39. 6241
  40. 961

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