Math Grade 1 Quiz The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones-1.NBT.B.2.B

In this standard, students learn about the structure of the numbers 11 through 19. While these numbers might seem a bit unusual at first, they can be understood as being composed of a ten and a certain number of ones. For instance, the number 13 is made up of one ten and three ones. This understanding reinforces the concept of place value and helps students to see the relationship between tens and ones in two-digit numbers, especially in the ‘tens’.