(3*10)+(9*1)=39
8 tens.
500+10+6 = 516
9 rounds up to 10. You can't put ten tenths in one place, you need to regroup and increase the ones by one.
One ten is equal to ten ones
78 can be regrouped into 6 tens and 18 ones.
yes
(3*10)+(9*1)=39
6+6 7+7 10+8 6+4
8 tens.
500+10+6 = 516
9 rounds up to 10. You can't put ten tenths in one place, you need to regroup and increase the ones by one.
10+6
Ten of them because 10*1 = 10
One ten is equal to ten ones
10 ones equall 1 ten
There are ten ones in ten.