Video Transcript
What number is missing? 90 marshmallows equals what groups
of 10?
In this question, we’re being asked
how many 10s there are in 90. If there are 90 marshmallows, how
many groups of 10 can we make? We could make the number 90 using
place value blocks. 10, 20, 30, 40, 50, 60, 70, 80,
90. How many groups of 10 are
there? One, two, three, four, five, six,
seven, eight, nine. 90 marshmallows equals nine groups
of 10. The missing number is number
nine. We counted in 10s until we reached
90. Nine 10s made 90. The missing number is nine.
