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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 31 · 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. 1.19² =
  2. 2.79² =
  3. 3.41² =
  4. 4.69² =
  5. 5.31² =
  6. 6.79² =
  7. 7.19² =
  8. 8.49² =
  9. 9.39² =
  10. 10.21² =
  11. 11.29² =
  12. 12.71² =
  13. 13.49² =
  14. 14.59² =
  15. 15.81² =
  16. 16.29² =
  17. 17.29² =
  18. 18.31² =
  19. 19.49² =
  20. 20.41² =
  21. 21.39² =
  22. 22.69² =
  23. 23.29² =
  24. 24.61² =
  25. 25.31² =
  26. 26.71² =
  27. 27.49² =
  28. 28.61² =
  29. 29.51² =
  30. 30.51² =
  31. 31.51² =
  32. 32.59² =
  33. 33.39² =
  34. 34.59² =
  35. 35.71² =
  36. 36.39² =
  37. 37.29² =
  38. 38.69² =
  39. 39.21² =
  40. 40.79² =

Answer key

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

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