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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 850 · 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. 1.21² =
  2. 2.19² =
  3. 3.81² =
  4. 4.29² =
  5. 5.51² =
  6. 6.69² =
  7. 7.69² =
  8. 8.51² =
  9. 9.81² =
  10. 10.81² =
  11. 11.61² =
  12. 12.89² =
  13. 13.21² =
  14. 14.21² =
  15. 15.51² =
  16. 16.69² =
  17. 17.71² =
  18. 18.69² =
  19. 19.59² =
  20. 20.89² =
  21. 21.29² =
  22. 22.61² =
  23. 23.69² =
  24. 24.79² =
  25. 25.79² =
  26. 26.39² =
  27. 27.89² =
  28. 28.69² =
  29. 29.31² =
  30. 30.61² =
  31. 31.59² =
  32. 32.71² =
  33. 33.39² =
  34. 34.61² =
  35. 35.39² =
  36. 36.71² =
  37. 37.79² =
  38. 38.89² =
  39. 39.31² =
  40. 40.69² =

Answer key

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

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