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Subscribe to Homeschool Math Newsletter - filled with math teaching information February 2010 newsletter
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Multiply & divide decimals by 10, 100, or 1000
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The ideas in this borrowing lesson are taken from Add & Subtract 2-B ebook. Only a few examples of each problem type are shown; you should make more problems of each kind for the student. Subtracting in columns - borrowing
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45 − 7 = ?
In the first picture, we can't cross out 7 ones, so
we break down one ten-pillar. Now cross out 7 ones. What is left? __ tens and __ ones =____ |
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42 − 18 = ?
In the first picture, we can't cross out 1 ten and 8 ones, so we break down one ten-pillar. Now cross out 1 ten 8 ones. What is left? __ tens and __ ones =____ |
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These are just examples of the type of problems to do. You should provide much more practice than is shown here.
1. Break down a ten. Draw ten-pillars and ones. What do the numbers become?
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Do it also without the pictures.
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24 __tens __ones |
82
__tens __ones |
2. Break down a ten first. Then subtract ones and tens separately. Write down the subtraction sentence.
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55 − 17 = 38 | |||||||||||||||||
After practicing for a while the process of breaking the ten into ten ones, it is time to introduce the standard form of subtracting in columns.
Cross out 1 ten 6 ones. What is left? __tens __ ones
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Cross out 2 ten 8 ones. What is left? __tens __ ones
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1. Fill in the table. Break one ten down, then subtract.
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2. Subtract. Borrow from the tens when needed.
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Copyright 2003-2010 Maria Miller
http://www.homeschoolmath.net/