Sticker Valley

Math · Adding and subtracting

Missing Number: Find the missing number: 4 + ? = 7

A balance scale has blocks on one side and a box on the other: how many go in the box to make both sides weigh the same? It's 4 + ? = 7 as a picture. The missing number moves from the end to the start of the sum, first within 10 and then within 20.

  • Grades1st grade, 2nd grade
  • Levels5, from “4 + ? = 7, to 10” to “Mix to 20”
  • A roundAbout 10 questions, a few minutes
  • PriceWith any plan, from $7.99 a month
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A round of Missing Number on a phone

How Missing Number works

The 5 levels

  1. 4 + ? = 7, to 10
  2. ? + 3 = 7, to 10
  3. Mix to 10
  4. 4 + ? = 7, to 20
  5. Mix to 20

What it lines up with in school

Common Core State Standards for Mathematics. Standards vary by state, so check with your kid’s teacher.

1.OA.B.4
Treat subtraction as a missing-number adding problem.
1.OA.D.8
Find the missing number in an adding or subtracting equation.
2.OA.B.2
Add and subtract within 20 from memory.

Practice it at home

Questions about Missing Number

What grade is Missing Number for?
1st and 2nd grade. It’s a missing addend game with 5 levels that move up when your kid is ready.
Which standards does Missing Number cover?
It lines up with Common Core math 1.OA.B.4, 1.OA.D.8 and 2.OA.B.2. Standards vary by state, so check with your kid’s teacher for the exact match.
Does my kid need to read to play Missing Number?
Missing Number doesn’t read its questions aloud yet. Questions are short and built on pictures and numbers, so most kids in 1st and 2nd grade can play on their own.
How long is a round of Missing Number?
About 10 questions, a few minutes. Nine right on the first try and the next round is a level harder; a tough round steps back one.
Is Missing Number free?
It comes with every plan, from $7.99 a month, with a 7-day free trial. Number Garden and Gator Compare are free.

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