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count by tens starting with 40 fill in the blanks so let's count by 10 starting with 4 or count by tens starting with 40 so 40 is for tens so if we add 10 to that we're going to get five tens or 50 now if we add ten to that we're going to get six 10s or 60 now if we had 10 to that we're going to get seven tens or 70 but we don't have to type that in because they've already put that there for us but then if we let's keep adding tens so we had 10 270 or is ten to seven tens we're going to have eight 10s or 80 add 10 to that you're going to have nine 10s or 90 and then we're done let's do one more of these count by tens starting with 656 fill in the blanks well each time we want to add we want to add 110 so this 656 it's six hundreds five tens and six ones well now we're going to add 10 to it so instead of having five tens we want to have six tens so it's going to be 666 666 ones let's add ten again well now in the last one we had six 10s now we want to have seven tens so it's going to be 676 now let's add another 10 well now we're going to have six hundreds eight tens and six or 686 now let's add 10 again so now we're going to have six hundreds instead of eight tens we're going to have nine tens and six ones so 696 now the next one's going to be interesting we want to add another ten to this but how do we have if we add another 10 to this what do we have in the tens place well one way to think about this is you could view 609 tens as 69 tens so if you have 69 tens and you add one more 10 you're going to have 70 tens so you're going to have 70 tens and six ones so 696 you add 10 to you get 706 once again you could view this as sixty five tens and six ones so 65 tens sixty six 10s 67 tens 68 tens 69 tens and 70 tens 706