Let us count them usingour cards. Uhm---m! One card for10 this whole group! And six cards1 for this group of birds. So, these cards show 16 birds. 1 1 1 10 1 1 1 But where did they all come from? This could be a good chance to initiate a discussion about migrating birds coming from far- off places. Also encourage and help children to recognise patterns in which different birds fly. ✤Soon 25 more birds flew in. Let us add to see how many birds in all there are now. For 16 + 25 we write: 10 1 11116 10 111 1010 11111+2 5 1Putting all the s 10 1 together, we get eleven s. Of11 11116 those, ten s 1010 1111 1 make one10 . 1010 111 1 +2 5 And we are left 1 with one1 . 10 1 1 Now putting together16 10 10 10all the s, we get1010 1+25 10four s. 41 So, the total number of birds is 41. In chapter 8, children would have made token cards. The same token cards should be used before children do written sums. How Many Cranes and Swans? There are 31 cranes and 39 swans. Let us find out how many swansand cranes there are in all. In the same way, we will add the number of swans and cranes. 10 1 1111Number of Swans 3 9 10 10 10 11111 101010 1Number of Cranes + 31 Also try adding without writing. The total number of swans and cranes is ___________. One morning, Suraj saw that out of 70 birds only 26 birds were left. The rest had gone away. How many birds have gone away?✤ 10 1 10 10 10 70 10 10 10 10 111– 2 6 1010 111 _____________ birds have gone away. Suraj, don't be sad! Let us hope they come back next year. Practice Time ✤Rahul scored 23 runs in a cricket match and Dhoni scored 69. How many runs did they make in all? 10 1 23 +6 9 69 They made ___________ runs in all. ✤Dema sold 48 shawls in a fair. Next day he sold 17 more shawls. How many shawls in all did he sell? 10 1 Dema sold ___________ shawls in all. ✤MunnuBunnu rabbit can eat 29 carrots in one week. rabbit can eat 42 carrots in one week. Who eats more in a week , and by how much? 10 1 _________ eats _________ more carrots. ✤. Her mother is 58 years old. Neha is 29 years old How many years older is Neha's mother? 10 1 Mother is ___________ years older than Neha. Find the Answer 2 43 26 981 +1 7 –2 7 +1 93 +3 35 47 38 04 +4 73 –5 9 –6 7 –2 3 94 89 47 6 –2 5 +3 8 –8 7 –2 8 More such examples may be set for practice. Catch the Right Bus! Card No. 27 + 22 49 Card No.Card No. 8848 – 21 + 19 Card No. 93 – 18 Card No.Card No. 2538 + 24 + 37 Solve to get the busnumber on each card. Match the card with the bus number and see who will sit in which bus. Card No. 47 + 28 Card No. 37 + 12 Card No. 99 – 32 Now you write your own numbers. Make two different cards for each bus. + – 75 49 – + 67 67 + + 49 75 More such exercises can be done to make children see how any number can be made using different combinations of numbers by addition and subtraction. Cross Me Out! Come! Today, we will play 'cross me out' with our teacher. Think of some numbers between 10 to 50. Write them in the box. Do not repeat a number. Cross out the number you get by adding 27 and 12! 27 + 10 = 37 and plus 2 is 39. Parents can help children in playing this game. Call out simple addition sums like 18 + 4. Gradually proceed to more challenging additions. Also give children turns to speak out numbers while parents do the crossing out. Similar games can be used for subtraction as well. Come on! Cross out 39! Whoever crosses out all the numbers first will be the winner. Now you can finish this game for Razia. Ask your teacher or friend to speak out two numbers to add. Chakachak Toli Chakachak in Hindi means clean and shining. Chakachak Toli is the name of a group of children who work to clean their park. Shreya collects the money and writes it in her diary. Help Shreya to find how much money is left at the end of the month. Diary October October 3 — collected Rs 60 October 7 — bought a broom for Rs 18 October 12 — bought a phenyl bottle for Rs 25 October 25 — collected Rs 27 from the cards we made Total money collected — Total money spent — Money left at the end of October — Children of Chakachak Toli counted the number of trees in the park. Trees Number of trees 90 75 82 68 94 ✤ more than trees .trees were How many more? ✤ .✤ .Draw the tree which is least in number Draw the tree which is most in number ✤Children planted some more trees to make 100. How many more did they plant? _________