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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 711 · 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. 3.21² =
  4. 4.71² =
  5. 5.81² =
  6. 6.41² =
  7. 7.39² =
  8. 8.89² =
  9. 9.29² =
  10. 10.29² =
  11. 11.71² =
  12. 12.89² =
  13. 13.39² =
  14. 14.51² =
  15. 15.69² =
  16. 16.51² =
  17. 17.61² =
  18. 18.59² =
  19. 19.39² =
  20. 20.79² =
  21. 21.79² =
  22. 22.39² =
  23. 23.71² =
  24. 24.31² =
  25. 25.39² =
  26. 26.61² =
  27. 27.91² =
  28. 28.49² =
  29. 29.59² =
  30. 30.41² =
  31. 31.71² =
  32. 32.29² =
  33. 33.51² =
  34. 34.19² =
  35. 35.51² =
  36. 36.91² =
  37. 37.39² =
  38. 38.79² =
  39. 39.69² =
  40. 40.91² =

Answer key

  1. 1681
  2. 7921
  3. 441
  4. 5041
  5. 6561
  6. 1681
  7. 1521
  8. 7921
  9. 841
  10. 841
  11. 5041
  12. 7921
  13. 1521
  14. 2601
  15. 4761
  16. 2601
  17. 3721
  18. 3481
  19. 1521
  20. 6241
  21. 6241
  22. 1521
  23. 5041
  24. 961
  25. 1521
  26. 3721
  27. 8281
  28. 2401
  29. 3481
  30. 1681
  31. 5041
  32. 841
  33. 2601
  34. 361
  35. 2601
  36. 8281
  37. 1521
  38. 6241
  39. 4761
  40. 8281

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