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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 129 · 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. 1.69² =
  2. 2.91² =
  3. 3.19² =
  4. 4.79² =
  5. 5.71² =
  6. 6.69² =
  7. 7.51² =
  8. 8.89² =
  9. 9.39² =
  10. 10.31² =
  11. 11.51² =
  12. 12.51² =
  13. 13.39² =
  14. 14.29² =
  15. 15.91² =
  16. 16.21² =
  17. 17.79² =
  18. 18.81² =
  19. 19.39² =
  20. 20.79² =
  21. 21.61² =
  22. 22.71² =
  23. 23.71² =
  24. 24.81² =
  25. 25.89² =
  26. 26.21² =
  27. 27.71² =
  28. 28.49² =
  29. 29.19² =
  30. 30.61² =
  31. 31.91² =
  32. 32.21² =
  33. 33.19² =
  34. 34.59² =
  35. 35.71² =
  36. 36.19² =
  37. 37.49² =
  38. 38.19² =
  39. 39.39² =
  40. 40.69² =

Answer key

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

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