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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 52 · 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. 2.19² =
  3. 3.59² =
  4. 4.91² =
  5. 5.49² =
  6. 6.39² =
  7. 7.79² =
  8. 8.21² =
  9. 9.89² =
  10. 10.31² =
  11. 11.49² =
  12. 12.91² =
  13. 13.19² =
  14. 14.79² =
  15. 15.79² =
  16. 16.89² =
  17. 17.51² =
  18. 18.61² =
  19. 19.19² =
  20. 20.61² =
  21. 21.71² =
  22. 22.41² =
  23. 23.29² =
  24. 24.31² =
  25. 25.91² =
  26. 26.71² =
  27. 27.41² =
  28. 28.41² =
  29. 29.31² =
  30. 30.61² =
  31. 31.19² =
  32. 32.69² =
  33. 33.59² =
  34. 34.49² =
  35. 35.79² =
  36. 36.19² =
  37. 37.71² =
  38. 38.79² =
  39. 39.19² =
  40. 40.29² =

Answer key

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

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