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David sees apples on the apple tree. If he picks
of them, how many will be left?
To solve this problem we will subtract because David is taking away apples.
We can start at and count back
.
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Subtract:
When we subtract from a two digit number, the only number that changes in our answer is the tens position, and it will always go down by
. Mentally, we can subtract
from the number in the tens place to find our answer.
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Fill in the blank
,
, __________ ,
,
In this series we are adding each time, or counting by
.
,
,
, and
.
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What digit is in the ones place?
The ones place is always the first number on the right.
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