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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 426 · 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. 2.69² =
  3. 3.49² =
  4. 4.81² =
  5. 5.91² =
  6. 6.19² =
  7. 7.51² =
  8. 8.19² =
  9. 9.29² =
  10. 10.71² =
  11. 11.59² =
  12. 12.69² =
  13. 13.19² =
  14. 14.59² =
  15. 15.21² =
  16. 16.49² =
  17. 17.31² =
  18. 18.59² =
  19. 19.91² =
  20. 20.69² =
  21. 21.39² =
  22. 22.39² =
  23. 23.19² =
  24. 24.59² =
  25. 25.29² =
  26. 26.79² =
  27. 27.51² =
  28. 28.49² =
  29. 29.79² =
  30. 30.31² =
  31. 31.19² =
  32. 32.31² =
  33. 33.41² =
  34. 34.69² =
  35. 35.91² =
  36. 36.79² =
  37. 37.31² =
  38. 38.51² =
  39. 39.81² =
  40. 40.69² =

Answer key

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

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