Students discover that every number can break into two parts — and those parts always add back up to the whole — the big idea that connects adding and subtracting.
Students will be able to…
The number 7 can be 3 and 4, or 5 and 2, or 6 and 1. How can one number be made of different parts?
Project this and change the whole and one part. Watch the other part change — the two parts always add up to the whole!
Tap any phase to open the teacher moves and student actions.
7 crayons in two hands — how many ways can you split them?
Teacher models.
Class drives the Number Bond.
Students make bonds.
Missing part.
Aligned to the Common Core State Standards for Mathematics, including the Standards for Mathematical Practice.
Determine the unknown whole number in an addition or subtraction equation.
Add and subtract within 20; use decomposing a number.
Use addition and subtraction within 20 to solve problems.
Understand the meaning of the equal sign.
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students find every pair of parts that makes 10 and connect them with rainbow arcs (0–10, 1–9, 2–8…). A printable make-10 rainbow is in the Math library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.