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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 709 · 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. 1.89² =
  2. 2.29² =
  3. 3.39² =
  4. 4.81² =
  5. 5.21² =
  6. 6.89² =
  7. 7.41² =
  8. 8.49² =
  9. 9.29² =
  10. 10.69² =
  11. 11.71² =
  12. 12.61² =
  13. 13.49² =
  14. 14.89² =
  15. 15.31² =
  16. 16.19² =
  17. 17.79² =
  18. 18.71² =
  19. 19.71² =
  20. 20.61² =
  21. 21.51² =
  22. 22.41² =
  23. 23.91² =
  24. 24.29² =
  25. 25.61² =
  26. 26.49² =
  27. 27.69² =
  28. 28.21² =
  29. 29.71² =
  30. 30.79² =
  31. 31.39² =
  32. 32.49² =
  33. 33.79² =
  34. 34.39² =
  35. 35.91² =
  36. 36.69² =
  37. 37.71² =
  38. 38.91² =
  39. 39.51² =
  40. 40.61² =

Answer key

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

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