Question

Greg is using place-value blocks to find the difference of 2.56 – 1.65.
First, he models 2.56 with the blocks. Then he subtracts hundredths by crossing out 5 hundredths. What should he do next?
A. Regroup one whole as 10 tenths, so tenths can be subtracted.
B. Subtract ones by crossing out one.
C. Subtract tenths by crossing out 2 tenths.
D. Regroup one tenth as 10 hundredths, so hundredths can be subtracted.

Answer 1

ok, so it looks like the subtraction is being done like this:

1) 2.56 - 0.05 = 2.51

so next, we still have 1.6 to subtract as follows:

2) 2.51
- 1.6
====

so what do you think needs to happen here?

Answer 2

notice the tenths column

Answer 3

we can't subtract 6 from 5 - so what do we need to do?

Answer 4

u mean 5 from 6?

Answer 5

no - I mean 6 from 5

Answer 6

o my bad u regroup