The Brandywine School District presents The Singapore Math Series Session 1I

1. The Brandywine School District presents The Singapore Math Series Session 1I Addition and Subtraction Created by Hester Sutton March 2011

2. A man sold 230 balloons at a carnival in the morning. He sold another 86 balloons in the evening. a) How many balloons did he sell in all? • How many more balloons did he sell in the morning than in the evening?

3. A man sold 230 balloons at a carnival in the morning. He sold another 86 balloons in the evening. a) How many balloons did he sell in all? Morning Afternoon 230 86 ?

4. A man sold 230 balloons at a carnival in the morning. He sold another 86 balloons in the evening. How many did he sell in all? 1 6 3

5. Using Number Bonds Addition part + part = whole 230 part 316 whole 86 part

6. A man sold 230 balloons at a carnival in the morning. He sold another 86 balloons in the evening. a) How many balloons did he sell in all? (230 + 70)+16 230 + 86 230 + (70+16) 300+16=316 316 balloons were sold in all.

7. A man sold 230 balloons at a carnival in the morning. He sold another 86 balloons in the evening. a) How many balloons did he sell in all? • How many more balloons did he sell in the morning than in the evening?

8. A man sold 230 balloons at a carnival in the morning. He sold another 86 balloons in the evening. • How many more balloons did he sell in the morning than in the evening? 230 Morning Evening 86 ?

9. A man sold 230 balloons at a carnival in the morning. He sold another 86 balloons in the evening. How many more balloons did he sell in the morning than in the evening? 1 4 4

10. Using Number Bonds Subtraction part part whole - = 86 230 part 144 whole part

11. Mary made 686 paper flowers. She sold some of them. If 298 were left over, how many flowers did she sell? Using the Bar Model Mary sold 384 flowers. ? 298 Mary’s Paper Flowers 686 686 - 298 686 – 300 + 2 = 386 + 2 = 388

12. Mary made 686 paper flowers. She sold some of them. If 298 were left over, how many flowers did she sell? Using Number Bonds ? Part 686 298 Whole Part

13. 686 - 298 = 388 hundreds tens ones

14. 134 girls and 119 boys took part in an art competition. How many more girls than boys were there? Comparison bar model. 134 girls boys 119 ? Using a mental math strategy: 134 - 119 134 – 120 + 1 14 + 1 = 15 There were 15 more girls than boys.

15. John read 32 pages in the morning. He read 14 fewer pages in the afternoon. a) How many pages did he read in the afternoon? b) How many pages did he read altogether? 32 Morning Afternoon ? 14 32 – 14 = 18 John read 18 pages in the afternoon.

16. 14 Part 32 ? Whole Part

17. John read 32 pages in the morning. He read 14 fewer pages in the afternoon. a) How many pages did he read in the afternoon? b) How many pages did he read altogether? 32 Morning ? Afternoon 32 + 18 = 50 18 John read 50 pages altogether.

18. 32 Part ? Whole 18 Part

19. Addition - Thousands A shop sold 957 beef burritos and 1238 chicken burritos. How many burritos were sold altogether? 957 1238 ?

20. 957 Part 2195 Whole 1238 Part

21. 957 +1238 = 2195 Ones Thousands Hundreds Tens

22. The total weight of Peter, David, and Henry is 123 kg. Peter is 15 kg heavier than David. David is 3 kg lighter than Henry. Find Henry’s weight. D+15 D + + D+3 = 123 kg Peter 15kg 123 kg David Henry 3kg

23. D+15 + D + D+3 = 123 kg D + D + D + 18 = 123 kg D + D + D = 105 kg D = 35 kg H = (35 + 3)kg H = 38 kg Henry weighs 38 Kg