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Published byAmber Kennedy Modified over 8 years ago
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Key idea: To be able to multiply a number by 10, 100 and 1000 WILF: Hi, I’m Wilf, pleased to meet you! WhatI’mLookingFor Children who can multiply by 10, 100 and 1000, then say or write the new number.
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Thhto 1111 x10 In the decimal system, the number in each column is 10 times bigger than the number to its right. 1010001001
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In the decimal system, the number in each column is 10 times bigger than the number to its right. Thhto 1111 x10
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Thhto 6 6 x10 If we multiply any digit by ten it will move into the next column We must put a 0 in the empty units column to hold the place so 6 x 10 = 60 0
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Let’s look at another number 23 x 10 = 230 Thhto 23 x10 2 3 Then we must remember to put the zero in to the hold the digits in place! 0
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Let’s try these together! 48 x 10 = 93 x 10 = 134 x 10 = 256 x 10 = 889 x 10 = 480 Write the answers on your boards 930 1,340 2,560 8,890
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Thhto 6 6 If we multiply 6 by a hundred it will move up two columns X 100 We must put a 0 in the empty columns to hold the place – 6 x 100 = 600 00
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Let’s try these together! 8 x 100 = 15 x 100 = 28 x 100= 134 x 100 = 267 x 100 = 800 Write the answers on your boards. 1,500 2,800 13,400 26,700
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Thhto 6 6 If we multiply 6 by a thousand it will move up three columns We must put a 0 in the empty columns to hold the place – 6 x 1000 = 6000 000 x1000
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Another way to think about it: 39 x 100 = 39 think X 1 = 39 00 So, 39 X 100 = 3,900
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Let’s try these examples! 9 x 1000 = 13 x 1000 = 64 x 1000= 149 x 1000 = 352 x 1000 = 9,000 Write the answers on your boards. 13,000 64,000 149,000 352,000
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Let’s try some more! Copy each problem and write the answer on your board.
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19 x 100 = 32 x 10 = 81 x 1,000= 199 x 1 = 61 x 10,000 = Use what you know and attempt this one! 1900 320 81,000 199 610,000
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