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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 577 · 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. 1.69² =
  2. 2.59² =
  3. 3.29² =
  4. 4.89² =
  5. 5.49² =
  6. 6.69² =
  7. 7.71² =
  8. 8.81² =
  9. 9.51² =
  10. 10.69² =
  11. 11.39² =
  12. 12.61² =
  13. 13.79² =
  14. 14.79² =
  15. 15.51² =
  16. 16.89² =
  17. 17.69² =
  18. 18.29² =
  19. 19.81² =
  20. 20.31² =
  21. 21.81² =
  22. 22.61² =
  23. 23.81² =
  24. 24.91² =
  25. 25.71² =
  26. 26.31² =
  27. 27.81² =
  28. 28.51² =
  29. 29.19² =
  30. 30.89² =
  31. 31.61² =
  32. 32.29² =
  33. 33.21² =
  34. 34.81² =
  35. 35.91² =
  36. 36.21² =
  37. 37.91² =
  38. 38.61² =
  39. 39.51² =
  40. 40.61² =

Answer key

  1. 4761
  2. 3481
  3. 841
  4. 7921
  5. 2401
  6. 4761
  7. 5041
  8. 6561
  9. 2601
  10. 4761
  11. 1521
  12. 3721
  13. 6241
  14. 6241
  15. 2601
  16. 7921
  17. 4761
  18. 841
  19. 6561
  20. 961
  21. 6561
  22. 3721
  23. 6561
  24. 8281
  25. 5041
  26. 961
  27. 6561
  28. 2601
  29. 361
  30. 7921
  31. 3721
  32. 841
  33. 441
  34. 6561
  35. 8281
  36. 441
  37. 8281
  38. 3721
  39. 2601
  40. 3721

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