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E Q U A L CONCEPT Developed by Ivan Seneviratne

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EQUAL CONCEPT The longer bar has the same length as the sum of the 2 shorter bars. Therefore, to find the length of the unknown shorter bar, you need to subtract 8 from 15. Find the missing number in the blank. 8 + ______ = 15 8 8 ? ? 15 15 15 – 8 = 7 The unknown value is 7. 7

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A._____ + 9 = 17 B.163 + _____ = 399 C.7613 695 = 8308 Try these EQUAL CONCEPT PRACTICE

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A. ___ + 9 = 17 9 9 ? ? 17 17 ? ? 399 399 163 163 695 695 8308 8308 7613 7613 Solutions C. 7613 695 = 8308 8 17 - 9 = 8 B. 163 + ___ = = = = 399 399 - 163 = 236 236 + EQUAL CONCEPT

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Find the missing number in the blank. _____ - 7 = 12 12 12 The longer bar has the same length as the sum of the 2 shorter bars. Therefore, to find the length of the unknown longer bar, you need to add 7 to 12. 12 + 7 = 19 The unknown value is 19. 7 7 ? ? EQUAL CONCEPT

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A._____ - 8 = 17 B.163 - _____ = 87 C.3101 1095 = 2006 Try these EQUAL CONCEPT PRACTICE

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A. ___ - 8 = 17 8 8 ? ? 17 17 ? ? 87 87 163 163 1095 1095 2006 2006 3101 3101 Solutions C. 3101 1095 = 2006 25 8 + 17 = 25 B. 163 - ___ = 87 163 - 87 = 76 76 - EQUAL CONCEPT PRACTICE

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EQUAL CONCEPT After selling 168 tickets, ? 352 352 168 168 James still had 352 tickets left. How many tickets did James have at first? To find the number of tickets James had at first, you need to add 352 to 168. 168 + 352 = 520 James had 520 tickets at the beginning.

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There were 23 fish balls in a bowl. 23 23 ? 7 7 5 5 How many fish balls were left in the bowl? Norman ate 7 fish balls. Daniel ate 5 fish balls. From the model, you can write down the following equation. 23 - 7 - 5 = 11 There were 11 fishballs left in the bowl. EQUAL CONCEPT

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1.16 boys and 13 girls took part in a walkathon. If 5 teachers joined them, how many people took part in the walkathon? Try these EQUAL CONCEPT PRACTICE

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1.16 boys and 16 + 13 + 5 = 34 ? 16 16 13 13 5 5 Solutions how many people took part in the walkathon? how many people took part in the walkathon? If 5 teachers joined them, If 5 teachers joined them, 13 girls took part in a walkathon. There were 34 people who took part in the walkathon. EQUAL CONCEPT PRACTICE

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2.A clerk was sent to deliver 155 books to a bookshop. On the way, 27 books were destroyed in the rain and 52 books were crumpled. How many books were in good condition? Try these EQUAL CONCEPT PRACTICE

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How many books were in good condition? 27 27 52 52 27 + 52 = 79 155 - 79 = 76 Solutions 2.A clerk was sent to deliver 155 books to a bookshop. On the way, 27 books were destroyed in the rain and 52 books were crumpled. and 52 books were crumpled. 155 155 ? There were 76 books in good condition. EQUAL CONCEPT PRACTICE

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3.In a week, a fruit seller sold 520 apples during weekdays and 798 apples during weekend. If he threw away 57 rotten apples and had 245 apples left, how many apples did he have at first? Try these EQUAL CONCEPT PRACTICE

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3.In a week, 520 520 798 798 57 57 245 245 The fruit seller had 1620 apples at the beginning. Solutions ? how many apples did he have at first? how many apples did he have at first? a fruit seller sold 520 apples during weekdays and 798 apples during weekend. If he threw away 57 rotten apples and If he threw away 57 rotten apples and had 245 apples left, 520 + 798 + 57 + 245 = 1620 EQUAL CONCEPT PRACTICE

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3.In a week, 520 520 Solutions how many apples did he have at first? how many apples did he have at first? a fruit seller sold 520 apples during weekdays and 798 apples during weekend. If he threw away 57 rotten apples and If he threw away 57 rotten apples and had 245 apples left, Weekdays 798 798 Weekend 57 57 Rotten 245 245 Leftover ? 520 + 798 + 57 + 245 = 1620 The fruit seller had 1620 apples at the beginning. EQUAL CONCEPT PRACTICE

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4. Meling spent of her money on a blouse and of it on a skirt. What fraction of her money did she have left? Try these EQUAL CONCEPT PRACTICE 2929 1616

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5.Hale had 6 watermelons. She gave 2 watermelons to Bob and 1 watermelons to Verdun. How many watermelons had she left? Try these EQUAL CONCEPT PRACTICE 1212 3434

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This presentation is developed by Ivan Seneviratne © 2006 purely for personal use. ivanthexplorer@yahoo.co.uk

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