← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 606 · 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. 1.49² =
  2. 2.91² =
  3. 3.49² =
  4. 4.71² =
  5. 5.71² =
  6. 6.41² =
  7. 7.79² =
  8. 8.41² =
  9. 9.51² =
  10. 10.29² =
  11. 11.49² =
  12. 12.79² =
  13. 13.69² =
  14. 14.51² =
  15. 15.41² =
  16. 16.89² =
  17. 17.69² =
  18. 18.21² =
  19. 19.21² =
  20. 20.81² =
  21. 21.19² =
  22. 22.21² =
  23. 23.29² =
  24. 24.69² =
  25. 25.31² =
  26. 26.69² =
  27. 27.89² =
  28. 28.39² =
  29. 29.19² =
  30. 30.31² =
  31. 31.19² =
  32. 32.81² =
  33. 33.91² =
  34. 34.31² =
  35. 35.29² =
  36. 36.79² =
  37. 37.31² =
  38. 38.71² =
  39. 39.91² =
  40. 40.41² =

Answer key

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

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