The wrapped present
Grades 5–6The big idea
A box or letter just stands for a number we haven't found yet.
Think of it like a wrapped present: You can't see what's inside □ + 3 = 7, but the clues tell you exactly what it must be.
This one matters most. Algebra is absolutely essential. It is the gateway every later subject runs through: fractions and percentages, geometry, science, money, coding, and every grade of math after this. Nothing past here opens without it, so this is the one strand no child should skip.
Guess what's in the box
I have some marbles in a box, then add 3, and now there are 7. You can't see into the box, but you can reason: what plus 3 makes 7? The box held 4.
Wonder out loud
These are good questions to ask: yourself, a grown-up, or your math helper.
Hi! I help you see why the math works. Tap a question to start: