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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 861 · 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. 1.29² =
  2. 2.19² =
  3. 3.19² =
  4. 4.51² =
  5. 5.79² =
  6. 6.19² =
  7. 7.29² =
  8. 8.39² =
  9. 9.81² =
  10. 10.19² =
  11. 11.69² =
  12. 12.69² =
  13. 13.19² =
  14. 14.71² =
  15. 15.69² =
  16. 16.59² =
  17. 17.79² =
  18. 18.29² =
  19. 19.81² =
  20. 20.49² =
  21. 21.69² =
  22. 22.41² =
  23. 23.79² =
  24. 24.29² =
  25. 25.19² =
  26. 26.71² =
  27. 27.49² =
  28. 28.79² =
  29. 29.29² =
  30. 30.91² =
  31. 31.51² =
  32. 32.19² =
  33. 33.19² =
  34. 34.29² =
  35. 35.49² =
  36. 36.21² =
  37. 37.19² =
  38. 38.39² =
  39. 39.21² =
  40. 40.59² =

Answer key

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

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