12 Give and Take Kinnaree sells beads in the bazar. She sells loose beads and necklaces of 10 beads each. Razia wants 12 beads. So Kinnaree gives her one necklace and two loose beads. Now you find how many necklaces and loose beads the other children take. Beads Necklace of 10 beads Loose beads Razia 12 Reema 17 Aarif 24 Sonu 35 Simar 31 Encourage children to make groups of 10 using materials like beads, matchsticks, buttons etc. These concrete experiences will help develop their understanding. Razia Uhm---h! Razia has one necklace, and Reema two beads. Reema has one necklace and seven beads. Right! You can 12write it like this. +1 7 12 + 1 7 9 There are 9 loose beads. So, I write 9 in this box. 1 2 + 1 7 2 9 There are 2 necklaces. So, I write 2 in this box. I got it! Razia andReema have 2 necklaces and 9 beads in all. Practice Time ❈ How many beads are taken by Razia and Sonu? Razia 12 +3 5Sonu ___________ beads are taken by Razia and Sonu. One Extra Necklace Beads taken by Reema and Aarif – Reema Aarif Right! Now, add them.There are 11 loose beads. What do I write in the blue box? 10 loose beads make one necklace. Right? So add 1 more to the necklaces. + 1 2 7 4 Reema has 17 beads. Aarif has 24. I must first count all the loose beads together. + 1 2 7 4 Iwrite a small 1 to rememberone extra necklace. + 1 2 1 7 4 IOK! Now how write 1 inmany beads will 1 17 the beadthere be ? + 2 4 box. 1 Good! Now, Icount all the write 4 in 1necklaces. 7the necklace 1 box. +2 4 41 Ah! Reema and Aarif have 4 Yes, Reema andnecklaces and 1 Aarif have 41bead in all. beads in all. I can do it very fast in another way. Simple! If Aarif gives 3 to Reema, Reema will have 20. Aarif will have 21. So 20 + 21 = 41. Can you do it some other way? Add by writing and also without writingHow many beads do they have together? A B Reema Sonu+ 1 3 7 5 Aarif Razia + 2 1 4 2 _________ beads _________ beads How Many More Beads? A Sonu Aarif – 3 2 5 4 B Aarif Razia – 2 1 4 2 Sonu has ______ more beads Aarif has _____ more beads than Aarif.than Razia. C How many more beads does Simar have than Reema? Simar 31 –1 7Reema How will you take away 7 beads from 1 bead? Open 1 necklace of Simar. Simar has 31 beads. Reema has 17. Ah! So, Simar will have 2 necklaces and 11 beads. To remember, I will cross 3 and write a small 2 in the necklace box. 2 3 11 Also, write a small 1 in the bead box to – 1 7 remember there are 11 beads. Now it is easy. You can take away 7 beads from 11. Simar 2 3 11 Reema – 1 7 4 Yes! I have written 4 in the bead box. That was quick! Now take away 1 necklace from 2 necklaces. – 2 3 1 1 7 1 1 4 I have written 1 in the necklace box. Simar has 1 necklace and 4 beads more than Reema. Ah! Simar has 14 beads more than Reema. Practice Time: Also do it in your mind ❈Tanisha ha s 17 pencils. Siya has 25 pencils. How many pencils are there in all? If Siya gives 3 pencils,Tanisha 1 7 then Tanisha will have 20. Siya+2 5 Siya will have 22 pencils. It is easy to add 20 + 22. ❈In Muneeza's class, there are 13 13 English story books and 22 Hindi +2 2 story books. How many story books are there in all? 23 ❈ Sakshi had 23 fruits. She ate 15 –1 5 fruits.Howmanyfruits are left? ❈ 35Daljeet has 35 marbles. Arvind has +2 525 marbles. How many marbles do they have in all? ❈Nisha has 32 bangles. Sukhi has 1 6 3 2 –1 6bangles. How many more bangles does Nishahave? Venkatesha's Canteen Help Venkatesha to make the bills. Rupees Dosa 2 3 Uthappam 2 8 Total Rupees Idli 1 5 Coffee 8 Rupees Total Dahi Vada Chilli Rice 2 5 1 8 Soup Rupees 2 7 Total Noodles 1 5 Total In this chapter , the standard algorithm s for addition and subtraction have been explained using some examples. However, it should be emphasised that learning only algorithms does not help to develop children`s conceptual understanding of the operations. For this, it is important to give them many word problems and encourage them to find out alternative ways to solve them. It's Time to Buy! Oh! You again! No, this time I have More homework? to buy 8 pencils and 5 erasers. Sure! The pencils cost 16 rupees. The erasers cost 15 rupees. Uhm---m! 16 rupees means one 10-rupee note and six 1-rupee coins. So, I can write it like this. 1 6 5+1 I put the coins together. There are 11 coins. That 1becomes161and . +1 5 1 Very good! Now you can see there are 3 notes in all. 1161 +1 5 3 1 I have to pay 31 rupees, but I have Rs 40. So, find out how much money you get back. 14 0 –3 1 I will get back ________ rupees. Children should draw and make their own play money. They could be given different exercises and games which involve simple calculations. Practice Time ❈Shekhar has 32 rupees. He bought a ball for 17 rupees. How much money is left with him? I have a shortcut. If I take away 2 coins from 32 32 and 2 coins from 17, I will be left with 30 – 15.–1 7 ❈Soni bought biscuits for 24 rupees and a packet of chips for 16 rupees. How much money will she pay? 24 Try doing it without writing!16 ❈Fantoosh had 64 rupees. He spent 39 rupees at the fair. How much money is left with him? Also find a way to do6 4 this without writing.–3 9