🪐 Galaxy 1 🔢 Math Station 🎯 Mission 10
← Back to Math
Your avatar
Rank icon

Mission 10 — Subtracting Small Numbers

Galaxy 1 · Math Station · Subtraction Planet

I can subtract by taking away, use a number line, and solve simple subtraction facts within 10 and 20.

Mission progress 0/30 correct
🚀 Mission status Not started yet. Tap “Start Mission” to begin.
First Grade Math: This mission helps learners subtract small numbers by taking away. They use a number line to move left, build equations like 8 − 3 = 5, and practice subtraction facts within 10 and 20.
Skill focus Subtraction · Within 20
Mission type Practice · Quick Quiz
Best for First Grade Math

Mission Briefing — Subtraction means take away

In this mission, you will practice subtraction. Subtraction means take away to find how many are left.

Think “start, take, left”

  • Start with a number.
  • Take away some.
  • Count what is left.

Number line tip

  • Subtraction moves left.
  • Each step left is one less.

Say it out loud: “Eight take away three equals five.”

Picture: Number line (0–10).

Move left to subtract

Training Run — Take away with real objects

Tap to play and pause.

Put 10 small objects in a line (blocks, coins, or snacks). Count them together. Now take away 1, 2, or 3 objects and count how many are left. Say the subtraction sentence out loud (example: “10 take away 3 equals 7”). Then open the tracing pad and write the equation you said.

Tracing Pad
Tracing snapshot for print
Tip: Write a full equation like 9 − 4 = 5. Read it out loud: “Nine take away four equals five.”

Practice 1 — Drag & Drop: build subtraction equations

Drag the pieces to make a true subtraction equation.

Build: 9 minus 1 equals 8.

9-1=8

Build: 8 minus 3 equals 5.

8-3=5

Build: 10 minus 4 equals 6.

10-4=6

Build: 7 minus 2 equals 5.

7-2=5

Build: 6 minus 6 equals 0.

6-6=0

Build: 5 minus 4 equals 1.

5-4=1

Build: 12 minus 5 equals 7.

12-5=7

Build: 15 minus 7 equals 8.

15-7=8

Practice 2 — Number line subtraction

Tap the tick that shows the answer. Subtraction moves left.

What is 8 − 1? Tap the answer.

What is 10 − 2? Tap the answer.

What is 9 − 4? Tap the answer.

What is 7 − 5? Tap the answer.

What is 6 − 2? Tap the answer.

What is 10 − 7? Tap the answer.

What is 14 − 3? Tap the answer.

What is 20 − 6? Tap the answer.

Practice 3 — Slider questions — Subtract and find the answer

Move each slider to the correct answer.

Move the slider to show 9 − 2.

Current: 0

Move the slider to show 10 − 6.

Current: 0

Move the slider to show a number that is one less than 12.

Current: 0

Move the slider to show 8 − 8.

Current: 0

Move the slider to show 15 − 5.

Current: 0

Move the slider to show 6 − 1.

Current: 0

Move the slider to show 18 − 9.

Current: 0

Quick Check

Subtraction means…

What is 10 − 3?

What is 6 − 6?

Which equation is true?

One less than 9 is…

On a number line, subtraction moves…

What is 15 − 5?