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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 695 · 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. 1.19² =
  2. 2.49² =
  3. 3.19² =
  4. 4.71² =
  5. 5.49² =
  6. 6.39² =
  7. 7.49² =
  8. 8.79² =
  9. 9.69² =
  10. 10.61² =
  11. 11.69² =
  12. 12.51² =
  13. 13.19² =
  14. 14.49² =
  15. 15.49² =
  16. 16.71² =
  17. 17.21² =
  18. 18.21² =
  19. 19.61² =
  20. 20.69² =
  21. 21.69² =
  22. 22.21² =
  23. 23.41² =
  24. 24.19² =
  25. 25.49² =
  26. 26.39² =
  27. 27.61² =
  28. 28.19² =
  29. 29.29² =
  30. 30.31² =
  31. 31.41² =
  32. 32.29² =
  33. 33.41² =
  34. 34.51² =
  35. 35.21² =
  36. 36.69² =
  37. 37.61² =
  38. 38.29² =
  39. 39.91² =
  40. 40.59² =

Answer key

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

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