i-Ready Classroom Mathematics Kindergarten, Unit 4: Numbers 11-19 and 3D Shapes
In this unit, two new ideas share the stage. Your child learns that each teen number is ten ones plus some more ones, so 17 is 10 and 7, and shows teen numbers with ten-frames. Your child also explores solid shapes such as cubes, cones, cylinders, and spheres. Following adding within 5, this sets up the next unit, which stretches adding and subtracting up to 10.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Unit 4?
- Showing teen numbers with a full ten-frame and some extra ones, and writing equations like 17 = 10 + 7. Learn more: Teen numbers as ten and some more
- Telling three-dimensional, or solid, shapes like cubes and spheres from two-dimensional, or flat, shapes like squares and circles. Learn more: Telling flat shapes from solid shapes
- Comparing solid shapes by their faces, corners, and whether they roll or stack, such as a cube and a cylinder. Learn more: Comparing shapes by their sides and corners
Sample questions to try together
These are real questions from our practice. Tap the speaker to hear one read aloud, or the light bulb for a hint, and talk about the answer together.
Question 1 of 3
What do 10 and 1 make?
- 10
- 11
- 12
How you can help
- Draw two ten-frames on paper, fill one with 10 toys and put a few in the other, then ask your child to name and write the teen number.
- Collect a ball, a box, a can, and a party hat, and let your child sort them into shapes that roll and shapes that stack.
- Count 10 stairs and then some more, naming the step you land on as ten and some more, like 10 and 4 make 14.
Where kids can get stuck
- Thinking the 1 in 17 means one object, so they show 17 with 1 block and 7 blocks.
- Calling a cube a square because they see one of its flat faces.
- Filling a ten-frame with 9 or 11 objects, because they lose count while building the ten.
Practice makes perfect
Bobby's Math Club has practice problems that adapt to your child’s level, each with a detailed explanation and an easy-to-follow video, so your child can build confidence in these skills one step at a time.
Words your child will hear
- teen numbers
- The numbers 11 to 19, each made of ten and some more ones.
- ten ones
- Ten single things, which together make one ten.
- ten-frame
- A grid of 10 boxes, in two rows of 5, used to show numbers.
- three-dimensional
- Solid, like a block you can hold; also called 3D.
- cube
- A solid shape with 6 square faces, like a block.
- cylinder
- A solid shape with two round, flat ends, like a can.
- cone
- A solid shape with a round, flat bottom and a point at the top.
- sphere
- A solid shape that is perfectly round, like a ball.
Ready to build your child’s confidence with teen numbers and 3D shapes?
In Bobby's Math Club, your child practices these skills at just the right level, with a hint when they need one, a clear explanation after every question, and kid-friendly videos. Unlimited practice is free.
Join the club
Written by Robert “Bobby” Barnett
Bobby is an award-winning math teacher, the author of Meet Every Learner’s Needs, and the father of two elementary-school math learners. He uses Bobby’s Math Club with his own kids a few times every week. Learn more or contact Bobby.
Which math standards does i-Ready Classroom Mathematics Kindergarten Unit 4 cover?
i-Ready Classroom Mathematics Kindergarten Unit 4 covers these math standards. Each one links to what it means, sample questions, and teaching strategies.
For teachers: Unit names and order vary between editions and districts, so your school’s own materials have the exact sequence. Learn how Bobby's Math Club can help your students grow.