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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 156 · 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. 1.39² =
  2. 2.71² =
  3. 3.71² =
  4. 4.29² =
  5. 5.39² =
  6. 6.79² =
  7. 7.31² =
  8. 8.69² =
  9. 9.49² =
  10. 10.19² =
  11. 11.59² =
  12. 12.61² =
  13. 13.41² =
  14. 14.19² =
  15. 15.91² =
  16. 16.81² =
  17. 17.39² =
  18. 18.39² =
  19. 19.39² =
  20. 20.69² =
  21. 21.61² =
  22. 22.19² =
  23. 23.59² =
  24. 24.39² =
  25. 25.71² =
  26. 26.49² =
  27. 27.59² =
  28. 28.21² =
  29. 29.69² =
  30. 30.21² =
  31. 31.31² =
  32. 32.59² =
  33. 33.61² =
  34. 34.39² =
  35. 35.19² =
  36. 36.81² =
  37. 37.71² =
  38. 38.89² =
  39. 39.51² =
  40. 40.59² =

Answer key

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

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