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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 170 · 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. 1.31² =
  2. 2.79² =
  3. 3.39² =
  4. 4.29² =
  5. 5.69² =
  6. 6.51² =
  7. 7.19² =
  8. 8.71² =
  9. 9.21² =
  10. 10.29² =
  11. 11.79² =
  12. 12.59² =
  13. 13.19² =
  14. 14.79² =
  15. 15.19² =
  16. 16.49² =
  17. 17.21² =
  18. 18.19² =
  19. 19.91² =
  20. 20.91² =
  21. 21.59² =
  22. 22.89² =
  23. 23.49² =
  24. 24.19² =
  25. 25.89² =
  26. 26.61² =
  27. 27.91² =
  28. 28.61² =
  29. 29.79² =
  30. 30.59² =
  31. 31.49² =
  32. 32.91² =
  33. 33.39² =
  34. 34.79² =
  35. 35.69² =
  36. 36.39² =
  37. 37.41² =
  38. 38.29² =
  39. 39.71² =
  40. 40.19² =

Answer key

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

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