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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 528 · 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. 2.31² =
  3. 3.19² =
  4. 4.61² =
  5. 5.41² =
  6. 6.39² =
  7. 7.19² =
  8. 8.39² =
  9. 9.69² =
  10. 10.29² =
  11. 11.89² =
  12. 12.71² =
  13. 13.59² =
  14. 14.21² =
  15. 15.71² =
  16. 16.91² =
  17. 17.31² =
  18. 18.81² =
  19. 19.69² =
  20. 20.29² =
  21. 21.81² =
  22. 22.41² =
  23. 23.19² =
  24. 24.69² =
  25. 25.19² =
  26. 26.19² =
  27. 27.81² =
  28. 28.51² =
  29. 29.61² =
  30. 30.19² =
  31. 31.79² =
  32. 32.61² =
  33. 33.31² =
  34. 34.91² =
  35. 35.59² =
  36. 36.39² =
  37. 37.19² =
  38. 38.71² =
  39. 39.61² =
  40. 40.71² =

Answer key

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

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