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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 107 · 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. 1.41² =
  2. 2.89² =
  3. 3.29² =
  4. 4.79² =
  5. 5.51² =
  6. 6.21² =
  7. 7.61² =
  8. 8.59² =
  9. 9.51² =
  10. 10.51² =
  11. 11.39² =
  12. 12.79² =
  13. 13.31² =
  14. 14.19² =
  15. 15.29² =
  16. 16.79² =
  17. 17.51² =
  18. 18.39² =
  19. 19.61² =
  20. 20.39² =
  21. 21.61² =
  22. 22.89² =
  23. 23.81² =
  24. 24.81² =
  25. 25.61² =
  26. 26.81² =
  27. 27.51² =
  28. 28.41² =
  29. 29.29² =
  30. 30.19² =
  31. 31.89² =
  32. 32.69² =
  33. 33.71² =
  34. 34.49² =
  35. 35.29² =
  36. 36.61² =
  37. 37.69² =
  38. 38.29² =
  39. 39.59² =
  40. 40.71² =

Answer key

  1. 1681
  2. 7921
  3. 841
  4. 6241
  5. 2601
  6. 441
  7. 3721
  8. 3481
  9. 2601
  10. 2601
  11. 1521
  12. 6241
  13. 961
  14. 361
  15. 841
  16. 6241
  17. 2601
  18. 1521
  19. 3721
  20. 1521
  21. 3721
  22. 7921
  23. 6561
  24. 6561
  25. 3721
  26. 6561
  27. 2601
  28. 1681
  29. 841
  30. 361
  31. 7921
  32. 4761
  33. 5041
  34. 2401
  35. 841
  36. 3721
  37. 4761
  38. 841
  39. 3481
  40. 5041

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