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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 595 · 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. 1.29² =
  2. 2.71² =
  3. 3.89² =
  4. 4.91² =
  5. 5.61² =
  6. 6.39² =
  7. 7.71² =
  8. 8.19² =
  9. 9.69² =
  10. 10.31² =
  11. 11.19² =
  12. 12.81² =
  13. 13.69² =
  14. 14.61² =
  15. 15.29² =
  16. 16.31² =
  17. 17.79² =
  18. 18.89² =
  19. 19.61² =
  20. 20.79² =
  21. 21.59² =
  22. 22.21² =
  23. 23.81² =
  24. 24.19² =
  25. 25.21² =
  26. 26.29² =
  27. 27.19² =
  28. 28.91² =
  29. 29.51² =
  30. 30.81² =
  31. 31.69² =
  32. 32.19² =
  33. 33.49² =
  34. 34.91² =
  35. 35.29² =
  36. 36.81² =
  37. 37.61² =
  38. 38.29² =
  39. 39.61² =
  40. 40.71² =

Answer key

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

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