← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 233 · 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. 1.39² =
  2. 2.71² =
  3. 3.51² =
  4. 4.69² =
  5. 5.21² =
  6. 6.71² =
  7. 7.41² =
  8. 8.19² =
  9. 9.71² =
  10. 10.19² =
  11. 11.59² =
  12. 12.51² =
  13. 13.69² =
  14. 14.29² =
  15. 15.79² =
  16. 16.19² =
  17. 17.91² =
  18. 18.39² =
  19. 19.21² =
  20. 20.79² =
  21. 21.61² =
  22. 22.29² =
  23. 23.51² =
  24. 24.59² =
  25. 25.39² =
  26. 26.39² =
  27. 27.91² =
  28. 28.59² =
  29. 29.29² =
  30. 30.29² =
  31. 31.21² =
  32. 32.79² =
  33. 33.61² =
  34. 34.61² =
  35. 35.19² =
  36. 36.19² =
  37. 37.21² =
  38. 38.19² =
  39. 39.89² =
  40. 40.19² =

Answer key

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

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