Question Video: Understanding How Many Tens Make Tens Numbers Mathematics • First Year of Primary School

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.