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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 88 · 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. 1.79² =
  2. 2.71² =
  3. 3.79² =
  4. 4.41² =
  5. 5.81² =
  6. 6.21² =
  7. 7.59² =
  8. 8.21² =
  9. 9.59² =
  10. 10.69² =
  11. 11.61² =
  12. 12.61² =
  13. 13.19² =
  14. 14.81² =
  15. 15.59² =
  16. 16.71² =
  17. 17.21² =
  18. 18.21² =
  19. 19.59² =
  20. 20.59² =
  21. 21.41² =
  22. 22.41² =
  23. 23.61² =
  24. 24.21² =
  25. 25.51² =
  26. 26.29² =
  27. 27.39² =
  28. 28.49² =
  29. 29.21² =
  30. 30.69² =
  31. 31.29² =
  32. 32.21² =
  33. 33.89² =
  34. 34.59² =
  35. 35.49² =
  36. 36.29² =
  37. 37.31² =
  38. 38.41² =
  39. 39.81² =
  40. 40.19² =

Answer key

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

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