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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 92 · 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. 2.89² =
  3. 3.89² =
  4. 4.39² =
  5. 5.29² =
  6. 6.21² =
  7. 7.79² =
  8. 8.89² =
  9. 9.31² =
  10. 10.59² =
  11. 11.21² =
  12. 12.69² =
  13. 13.91² =
  14. 14.21² =
  15. 15.79² =
  16. 16.81² =
  17. 17.61² =
  18. 18.31² =
  19. 19.51² =
  20. 20.79² =
  21. 21.79² =
  22. 22.51² =
  23. 23.39² =
  24. 24.61² =
  25. 25.89² =
  26. 26.21² =
  27. 27.31² =
  28. 28.81² =
  29. 29.39² =
  30. 30.39² =
  31. 31.81² =
  32. 32.61² =
  33. 33.81² =
  34. 34.31² =
  35. 35.29² =
  36. 36.79² =
  37. 37.71² =
  38. 38.51² =
  39. 39.39² =
  40. 40.79² =

Answer key

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

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