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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 30 · 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. 1.21² =
  2. 2.81² =
  3. 3.49² =
  4. 4.81² =
  5. 5.69² =
  6. 6.19² =
  7. 7.71² =
  8. 8.29² =
  9. 9.29² =
  10. 10.19² =
  11. 11.39² =
  12. 12.49² =
  13. 13.81² =
  14. 14.79² =
  15. 15.19² =
  16. 16.91² =
  17. 17.81² =
  18. 18.59² =
  19. 19.59² =
  20. 20.81² =
  21. 21.89² =
  22. 22.29² =
  23. 23.31² =
  24. 24.39² =
  25. 25.19² =
  26. 26.91² =
  27. 27.81² =
  28. 28.71² =
  29. 29.39² =
  30. 30.91² =
  31. 31.79² =
  32. 32.29² =
  33. 33.41² =
  34. 34.61² =
  35. 35.41² =
  36. 36.31² =
  37. 37.49² =
  38. 38.91² =
  39. 39.51² =
  40. 40.51² =

Answer key

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

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