← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 180 · 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. 2.51² =
  3. 3.79² =
  4. 4.31² =
  5. 5.51² =
  6. 6.59² =
  7. 7.71² =
  8. 8.19² =
  9. 9.69² =
  10. 10.69² =
  11. 11.39² =
  12. 12.59² =
  13. 13.71² =
  14. 14.69² =
  15. 15.81² =
  16. 16.31² =
  17. 17.51² =
  18. 18.69² =
  19. 19.71² =
  20. 20.19² =
  21. 21.21² =
  22. 22.21² =
  23. 23.19² =
  24. 24.49² =
  25. 25.79² =
  26. 26.39² =
  27. 27.61² =
  28. 28.29² =
  29. 29.41² =
  30. 30.49² =
  31. 31.21² =
  32. 32.39² =
  33. 33.51² =
  34. 34.71² =
  35. 35.29² =
  36. 36.89² =
  37. 37.81² =
  38. 38.41² =
  39. 39.69² =
  40. 40.31² =

Answer key

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

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths