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.
 =

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

 = 10 cubes = 1 rod

This is an

= 10

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

= 100

 = 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

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

+5

 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=