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let's think about how many blocks we have here or what number this these blocks represent well I have four groups of a hundred here so I could say that I have four hundreds for hundreds I have three groups of ten here so I could write plus 3 tens plus 3 tens and then I have six ones here so I could write plus six ones plus six ones and so I can write that as I could write that as I could write a six in the ones place for my six ones three in the tens place for my three tens for my three tens and then a four and the hundreds place for my four hundredths so this is 436 436 436 now let's subtract from that let's subtract from that let's subtract from that the number the number 300 312 312 and let's think about what we would do here for subtracting 300 if we are subtracting 312 well we had six ones before we're taking away two ones so let me write that down we're going to take away two ones we're taking away one ten so we're taking away one 10 so minus 110 and we're taking away three hundredths so we're taking away so we're taking away three hundreds three hundreds so what's that going to do to us what's that going to do to us well we had 400s we're taking away three hundred so let's take them away let's take away let's take away the let's take away the one two and three hundreds and we're just left with 101 100 could do it over here 400s take minus four - three hundreds is going to be 100 now we had three tens we're taking away one ten so let's do that so we're going to be left with two tens so plus two tens three minus one is two three minus one is two and then last then we have six we had six ones we're taking away two ones and we're going to be left with four ones 6 minus 2 is 4 6 minus 2 is 4 and we're done 436 - 312 is 124 and you see how we did that we took away 3 hundredths we took away 110 and we took away two ones to get 124 which is 100 two tens and four ones