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I made group of tens and then added there was 40

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Take one stick of tens and nine units and take another two tens and one units then put them all together.

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I took the 1 from 21 and added it to 19 so I had 39 and I added the 1 to get 40

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I took the 1 from 21 and added it to 19 so I had 39 and I added the 1 to get 40

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I took 21 and 19 and took the one from 21 and took the 9 from 19 and this is what I got : 9+1=10 so one ten and you already have two others,and the ten from 19 so just add the 10 and you get 40.

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I took 9 and 1 away I added them made 10 and put that and it made 20 and then I put 20+20=40.

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I took 20 I added 1 then I took 9 units which would make 10 then I added 10 more units and that makes 40.

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I took two base ten blocks and split them into groups of three there were three blocks left so I made them into a group

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I took the nine and maid groups then there is one left so I added my one with the one on the twenty one then I counted the tens by two and it maid fourty.

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40-21=19 I know because
I counted backwards with these blocks.

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I started with 21 and I counted up by ones intill I got to 40.

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I put the one in the 21 to the 19 to make 20 so it's      20 and 20 then I counted by groups of 2s and I got to 40

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I made groups of five by making the 1 and the 9 and made ten then I broke it up and do the same thing with the 10 and the 20.  I ended up with eight groups of 5.

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Take the 1 from 21 add 20 to 19 then you get 39 add the 1 to that to get 40

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I took the 1 and added it to the 19 that makes 20 so 20+20=40

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I take the one from the 21and I add the 1 with the19 so 20 +20=40

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I took the 9 and the 1 and made a 10 after I add 20+10 and that makes 30 then I put 10 with 30 and that makes 40

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Make up some different ways to add 19 and 21 in your head.

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Make up some different ways to add 19 and 21 in your head.

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How many ways can you do it?