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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 583 · 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. 1.89² =
  2. 2.91² =
  3. 3.21² =
  4. 4.79² =
  5. 5.21² =
  6. 6.59² =
  7. 7.49² =
  8. 8.89² =
  9. 9.91² =
  10. 10.41² =
  11. 11.91² =
  12. 12.61² =
  13. 13.39² =
  14. 14.49² =
  15. 15.79² =
  16. 16.49² =
  17. 17.31² =
  18. 18.29² =
  19. 19.49² =
  20. 20.89² =
  21. 21.51² =
  22. 22.59² =
  23. 23.69² =
  24. 24.41² =
  25. 25.89² =
  26. 26.79² =
  27. 27.69² =
  28. 28.21² =
  29. 29.69² =
  30. 30.71² =
  31. 31.29² =
  32. 32.69² =
  33. 33.61² =
  34. 34.21² =
  35. 35.69² =
  36. 36.81² =
  37. 37.39² =
  38. 38.21² =
  39. 39.31² =
  40. 40.41² =

Answer key

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

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