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Subscribe to Homeschool Math Newsletter - filled with math teaching information  February 2010 newsletter
Latest from my blog This is where you'll find the latest happenings, news, & ideas in math teaching Math teaching videos My videos at YouTube show you how to teach concepts.
Divide decimals - why do we move the decimal point?
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The ideas in this place value lesson are taken from the place value ebook that I sell at MathMammoth.com. Only a few examples of each problem type are shown; you should make more problems of each kind for the student. Tens and ones place value practice
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Eleven
1 ten 1 one 10 + 1
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Thirteen
1 ten __ ones 10 + 3
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__________
1 ten __ ones 10 + __
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Sixteen
1 ten __ ones 10 + __
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__________
_ ten __ ones __ + __
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Twenty
2 tens 0 ones 20 + 0
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__________
2 tens __ ones 20 + __
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__________
__ tens __ ones __ + __
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__________
__ tens __ ones __ + __
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__________
2 tens __ ones 20 + __
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Thirty
3 tens 0 ones 30 + 0
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__________
__ tens __ ones __ + __
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__________
__ ten __ ones __ + __
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__________
__ ten __ ones __ + __
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Forty
__ tens 40 + 0
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4 tens 1 one 40 + 1
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Forty-two
4 tens 2 ones 40 + 2
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____________
__ tens __ ones 40 + __
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Fifty
5 tens 0 ones 50 + 0
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____________
__ tens __ ones 50 + __
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____________
__ tens __ ones ___ + __
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Seventy-eight
__ tens __ ones ___ + __
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____________
__ tens __ ones ___ + __
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____________
__ tens __ ones ___ + __
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____________
__ tens 0 ones ___ + 0
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____________
__ tens __ ones ___ + __
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Hundred
1 hundred and 100 + 0 + 0
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Example problem types
1. Make a number line from 0 till 40. Practice counting aloud upwards and downwards with your teacher.
2. Make a number line from 40 till 80. Practice counting up and down with your teacher.
3. Fill in the missing numbers on the number lines.
__|____|____|____|____|____|____|____|____|____|____|_
67
__|____|____|____|____|____|____|____|____|____|____|_
83
| 4. Fill in the missing parts on the number chart. | 5. Which is more? Use matches or base ten blocks if you need to. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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6. What number is...
| one more than 18?
one less than 39? |
two more than 16?
two less than 28? |
ten more than 25? ten less than 40? |
You can use the chart to help. You can make a game out of this, too!
7. a) Make a number line from 0 to 40.
b) Make a number line from 50 to 100.
8. Each ten-pillar has tens little cubes. Fill in the table. Write each number also as an addition.
5 tens 7 ones 50 + 7 = ___ |
__ tens __ ones ___ + __ = ___ |
__ tens __ ones ___ + __ = ___ |
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__ tens __ ones ___ + __ = ___ |
__ tens __ ones ___ + __ = ___ |
__ tens __ ones ___ + __ = ___ |
9. Match the number to its name.
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10. Break the numbers down to their tens and ones and write as addition.
| 73 = 20 + 3
70 = __ + __ |
45 = __ + __
72 = __ + __ | 50 = __ + __
55 = __ + __ |
11. Do the same the other way around! Add.
| 60 + 7 = __
80 + 0 = __ |
4 + 50 = __
9 + 50 = __ |
90 + 9 = __
1 + 60 = __ |
12. For each underlined number, find the number that is exactly 1 ten and 1 more. Write that number down and encircle it. What pattern do you notice - where is that number on the chart in relation to the underlined number?
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13. What numbers go on the empty lines?
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a. 88, 89, ___, ___ c. ___, ___, 71, 72 |
f. ___, ___, 66, 67 h. ___, 80, ___, 82 |
j. 41, ___, ___, 44 l. ___, 78, ___, 80 |
14. Circle the number that is more. If it is difficult, write down how many tens and ones the numbers have and represent them with base ten blocks, or with matches with ten-bundles.
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15. Can you build these numbers?
| a) This number has two more tens than 40 has, and the same amount of
ones as 17. |
| e) This number does not have any ones, and has two less tens than
66. |
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Copyright 2003-2010 Maria Miller
http://www.homeschoolmath.net/
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