To take from one hundred, open the hundred, then open a ten.
One hundred has no loose tens or ones on the frame, so to take from it, open the hundred first.
Open the hundred, and the tens row fills with ten beads. Then open one ten: nine tens stay and the ones row fills up.
Now both rows are ready. Take away the tens, then the ones.
It works because a hundred is nine tens and ten ones. Nothing is lost.
These are some of the questions on the sets. The printable sheets have more, with the bead frame drawn for each, and an answer key.
63. Open the hundred and a ten: 9 tens and 10 ones. 9 - 3 = 6 tens, and 10 - 7 = 3 ones.
15. 9 - 8 = 1 ten, and 10 - 5 = 5 ones.
35. 9 - 6 = 3 tens, and 10 - 5 = 5 ones.
9 tens and 10 ones. Nine tens and ten ones still make one hundred.
Ask a grown-up for ten stacks of ten coins or buttons, one hundred in all. Take some away, like thirty-seven. You will need to open a stack of ten to give the ones. Say how many tens and ones are left.
Make one hundred out of ten stacks of ten coins or buttons. Take some away, like 37, and let your child open a stack to give the ones.
