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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 306 · 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. 1.61² =
  2. 2.29² =
  3. 3.81² =
  4. 4.79² =
  5. 5.39² =
  6. 6.81² =
  7. 7.59² =
  8. 8.21² =
  9. 9.21² =
  10. 10.71² =
  11. 11.31² =
  12. 12.81² =
  13. 13.81² =
  14. 14.59² =
  15. 15.19² =
  16. 16.31² =
  17. 17.21² =
  18. 18.59² =
  19. 19.49² =
  20. 20.39² =
  21. 21.69² =
  22. 22.41² =
  23. 23.59² =
  24. 24.31² =
  25. 25.69² =
  26. 26.69² =
  27. 27.79² =
  28. 28.89² =
  29. 29.69² =
  30. 30.79² =
  31. 31.39² =
  32. 32.41² =
  33. 33.91² =
  34. 34.19² =
  35. 35.51² =
  36. 36.31² =
  37. 37.39² =
  38. 38.61² =
  39. 39.81² =
  40. 40.51² =

Answer key

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

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