القائمة الرئيسية
تسجيل دخول ولي الأمر / الطالب
الرئيسية
عن البوابة اتصل بنا
تابعنا على:
فيسبوك يوتيوب تويتر

Chapter 2 - Lesson 4: Subtraction Strategies up to 20 & Counting Back (-)

Interactive lesson with 5 learning stations and smart audio player - Chapter 2 - Lesson 4: Subtraction Strategies up to 20 & Counting Back (-)

4 مشاهدة آخر تحديث: 18 أكتوبر 2026
Station 1 of 5 Spark & Prepare: Goals & Discovery
Primary 1 - Math Chapter 2: Numbers up to 20, Addition, Subtraction & Measurement

Mastering Subtraction: Taking Away & Counting Back! ➖🍪

Click any sentence to listen 👆

Welcome back! Subtraction is the opposite of addition: it means removing or taking away some items from a whole set to find out how many are left! Imagine you have 9 fresh cookies and you share 3 with your brother, how many cookies remain? We start at 9 on our number line and jump backwards 3 steps: 8, 7, 6! The remainder is 6 cookies! Let us master subtraction facts up to 20!

➖ Subtraction Fundamentals

• Subtraction: Taking away to find the difference.
• Minus Sign (-): Indicates removal and deduction.
• Difference / Remainder: What is left over.
• Example: 15 apples - 5 apples = 10 apples remaining.

📉 Counting Back Strategy

To solve 12 - 3:
1. Start at 12.
2. Count backward 3 steps: 11, 10, 9!
3. The remaining difference is 9! Simple, logical, and dependable!

🧩 Subtraction Fact Challenges
8 - 3 = 5
Took 3 Away
10 - 4 = 6
Ten Fact
7 - 7 = 0
Subtract from Self

Tap any card to reveal its meaning, or tap the audio icon to listen:

Subtraction (-)
Tap to reveal definition 👆
Taking away some objects to determine what remains
📖 Def: Decreasing
Minus Sign (-)
Tap to reveal definition 👆
Symbol indicating subtraction
📖 Def: Minus operator
Difference
Tap to reveal definition 👆
The amount remaining after subtraction
📖 Def: Leftover quantity
Counting Back
Tap to reveal definition 👆
Counting backwards from the larger number
📖 Def: Mental subtraction strategy
Subtracting Zero
Tap to reveal definition 👆
Subtracting 0 leaves the number unchanged (8 - 0 = 8)
📖 Def: Zero property
Subtracting Itself
Tap to reveal definition 👆
Subtracting a number from itself equals 0 (9 - 9 = 0)
📖 Def: Zero remainder
Minuend
Tap to reveal definition 👆
The starting total quantity from which another is subtracted
📖 Def: Initial quantity
Subtrahend
Tap to reveal definition 👆
The quantity that is taken away
📖 Def: Quantity subtracted
Crossing Out
Tap to reveal definition 👆
Marking through drawn objects to visualize removal
📖 Def: Visual strategy
Comparing Difference
Tap to reveal definition 👆
Finding how much larger one number is than another
📖 Def: Comparative subtraction
Addition Check
Tap to reveal definition 👆
Verifying subtraction by adding the difference to subtrahend
📖 Def: Checking work
Math Solver
Tap to reveal definition 👆
A student who applies arithmetic facts accurately
📖 Def: Honor title

Click on an option to check your answer and view the detailed explanation:

1 What is 7 - 3?
2 What is 10 - 6?
3 What is 8 - 8?
4 What is 14 - 0?
5 There were 9 birds in a tree. 4 flew away. How many remain?
6 Which symbol represents subtraction?
7 What is 15 - 5?
8 If you start at 11 on the number line and jump back 2 steps, where do you land?
🎉 Congratulations! You have completed all lesson stations successfully!

أكملت دراسة هذا الدرس؟

احفظ إنجازك الآن لإضافة 5 نقاط تميز إلى رصيدك وتسجيل الدرس في لوحة إحصائياتك!

رحلة التعلم المستمرة — Math (لغات)
الدرس 12 من 16
الدرس التالي Chapter 2 - Lesson 5: Exploring Measurement: Length, Weight and Capacity
الدرس السابق Chapter 2 - Lesson 3: Addition Strategies up to 20 & Counting On (+)

معلومات الدرس

المرحلة:
المرحلة الابتدائية
الصف:
الصف الأول الابتدائي
المادة:
Math (لغات)
الوحدة:
Chapter 2: Numbers up to 20, Addition, Subtraction & Measurement

دروس Chapter 2: Numbers up to 20, Addition, Subtraction & Measurement

1 Chapter 2 - Lesson 1: Numbers 11 to 15 and Place Value (Tens & Ones) 2 Chapter 2 - Lesson 2: Numbers 16 to 20, Number Lines and Comparison (>, <, =) 3 Chapter 2 - Lesson 3: Addition Strategies up to 20 & Counting On (+) 4 Chapter 2 - Lesson 4: Subtraction Strategies up to 20 & Counting Back (-) الحالي 5 Chapter 2 - Lesson 5: Exploring Measurement: Length, Weight and Capacity 6 Chapter 2 - Lesson 6: Comprehensive Review: Numbers to 20, Operations & Sizes 7 Chapter 2 - Assessment 1: Comprehensive Digital Math Assessment 8 Chapter 2 - Assessment 2: Advanced Digital Math Assessment
الدرس التالي