Trading Game

A drink costs 50 cents and the machine won’t take my dollar bill.
I will trade my dollar bill for
4 quarters.

4 quarters = 1 dollar

This is an even trade.

I have two baseball cards of Chipper Jones. I want to trade one to my friend who has two Ken Griffey, Jr. cards. If we trade cards it would be an even trade.

wpe42.jpg (3392 bytes)

Ten cubes are an even trade for one rod because one rod is made of ten cubes.

	=
10 cubes	=	1 rod

This is an
even trade.

= 10

Since one flat is made from ten rods, ten rods would be an even trade for one flat.

wpeB.jpg (1861 bytes) = 100
Is this an even trade?

	=
10 rods	=	1 flat



Click the arrow to show an even trade for 17 cubes.

These 17 cubes can be traded for 1 rod and 7 cubes.

These 2 flats and 1 rod
can be traded.

wpeB.jpg (1861 bytes)

What is the value of 2 flats and 1 rod?



Click the arrows that show an even trade.

This chart shows 342.

I want to take away 3 cubes.

Hundreds	Tens	Ones

Since there are only 2 cubes I must regroup one of the rods. What is an even trade for 1 rod?
Then I will have 3 flats, 3 rods, and 12 cubes.

342 - 3 =

Hundreds	Tens	Ones

regroup

Hundreds	Tens	Ones

-3

Hundreds	Tens	Ones

=339

I started with 342.

Then I regrouped
1 ten for 10 ones.

Last I subtracted 3.

I just found these 5 cubes. Let's add them to the 339 we have.

Hundreds	Tens	Ones

Hundreds

Tens

Ones

regroup

Hundreds	Tens	Ones

   339
+   5

I started with 339.

Then I added the 5 new cubes.

Last, I regrouped.

Ask your teacher if you can trade this computer for the place value blocks. You can solve these problems using the flats, rods, and cubes.

529+3 = 24-7 =

340-9 = 455+6=

placevaluekids.gif (25052 bytes)