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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 3 · 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. 3.59² =
  4. 4.69² =
  5. 5.79² =
  6. 6.31² =
  7. 7.39² =
  8. 8.81² =
  9. 9.51² =
  10. 10.79² =
  11. 11.71² =
  12. 12.29² =
  13. 13.89² =
  14. 14.91² =
  15. 15.91² =
  16. 16.19² =
  17. 17.81² =
  18. 18.79² =
  19. 19.39² =
  20. 20.81² =
  21. 21.71² =
  22. 22.19² =
  23. 23.49² =
  24. 24.81² =
  25. 25.39² =
  26. 26.71² =
  27. 27.21² =
  28. 28.21² =
  29. 29.71² =
  30. 30.69² =
  31. 31.69² =
  32. 32.59² =
  33. 33.61² =
  34. 34.81² =
  35. 35.39² =
  36. 36.19² =
  37. 37.31² =
  38. 38.91² =
  39. 39.69² =
  40. 40.49² =

Answer key

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

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