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Ok so the partitioning strategy is when you have a sum like 13+22 so what you will do is 20 add 10 add 3 add 2 so after that then you will add them an you will end up with the answer. ok  now I am going to give us a sum you will work together to do it. 15+24= 12+27= 13+17=

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OK the Inverse rule is when you have a sum for example 16-9=something so what you will do is do 9+_=19 and then you will draw a number line and put the 9 at the start a you will add Numbers to get  to the nearest 10 if it is under 5 you will round down and if it over 5 you will round up so we will add 1 to are 9 to make ten and then add 6 you will then have sixteen bye.

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Bridge

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In split strategies you do a line from the ten's about a finger apart and write the answer to the ten's and do the same with the units.