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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 725 · 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. 2.29² =
  3. 3.81² =
  4. 4.89² =
  5. 5.29² =
  6. 6.19² =
  7. 7.91² =
  8. 8.39² =
  9. 9.19² =
  10. 10.79² =
  11. 11.51² =
  12. 12.59² =
  13. 13.19² =
  14. 14.19² =
  15. 15.39² =
  16. 16.21² =
  17. 17.69² =
  18. 18.61² =
  19. 19.51² =
  20. 20.31² =
  21. 21.81² =
  22. 22.69² =
  23. 23.79² =
  24. 24.91² =
  25. 25.59² =
  26. 26.89² =
  27. 27.31² =
  28. 28.29² =
  29. 29.41² =
  30. 30.69² =
  31. 31.61² =
  32. 32.59² =
  33. 33.69² =
  34. 34.79² =
  35. 35.49² =
  36. 36.71² =
  37. 37.79² =
  38. 38.61² =
  39. 39.71² =
  40. 40.69² =

Answer key

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

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