Does Alice have 1000 dollars?

Let's check.

Step 1. Understand

Step 2. Plan  We can use subtraction to check.

Step 3 Try

Think aloud

Let's put 1000 into different places.

There is zero one in ones place.

There is zero ten in tens place.

There is zero hundred in hundreds place.

There is one thousand in thousands place.

Let's take away one yuan.

We can put one in ones place.

We can regroup 1 thousand as 10 hundred 

in hundreds place.

We can regroup 1 hundred as 10 tens 

and nine hundreds left in hundred place.

We can regroup 1 ten as 10 ones

and nine tens left in tens place.

Take away 1 one from ones place.

There are nine ones in ones place.

1000 takes away 1 is nine hundred and ninety- nine.

Alice has 999 dollars.

Her mother gives her 1 dollar.

Now she has 1000 dollars.