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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 786 · 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. 1.71² =
  2. 2.79² =
  3. 3.31² =
  4. 4.79² =
  5. 5.21² =
  6. 6.51² =
  7. 7.41² =
  8. 8.71² =
  9. 9.49² =
  10. 10.79² =
  11. 11.41² =
  12. 12.69² =
  13. 13.69² =
  14. 14.91² =
  15. 15.49² =
  16. 16.49² =
  17. 17.79² =
  18. 18.21² =
  19. 19.41² =
  20. 20.39² =
  21. 21.39² =
  22. 22.51² =
  23. 23.81² =
  24. 24.19² =
  25. 25.49² =
  26. 26.79² =
  27. 27.29² =
  28. 28.51² =
  29. 29.71² =
  30. 30.59² =
  31. 31.49² =
  32. 32.89² =
  33. 33.79² =
  34. 34.79² =
  35. 35.21² =
  36. 36.31² =
  37. 37.51² =
  38. 38.21² =
  39. 39.69² =
  40. 40.51² =

Answer key

  1. 5041
  2. 6241
  3. 961
  4. 6241
  5. 441
  6. 2601
  7. 1681
  8. 5041
  9. 2401
  10. 6241
  11. 1681
  12. 4761
  13. 4761
  14. 8281
  15. 2401
  16. 2401
  17. 6241
  18. 441
  19. 1681
  20. 1521
  21. 1521
  22. 2601
  23. 6561
  24. 361
  25. 2401
  26. 6241
  27. 841
  28. 2601
  29. 5041
  30. 3481
  31. 2401
  32. 7921
  33. 6241
  34. 6241
  35. 441
  36. 961
  37. 2601
  38. 441
  39. 4761
  40. 2601

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