Subtraction using number bonds

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Videos, worksheets, solutions and activities to help students learn subtraction using number bonds in Singapore Math.

In this lesson, we will learn

• subtracting ones using number bonds
• subtracting tens using number bonds
• subtracting tens and ones using number bonds.

When subtracting 2-digit numbers, the Singapore Math teaches the students to subtract tens and ones using number bonds. The steps are shown below. With sufficient practice, the students should be able to do the math in their heads.

Subtracting Ones

For example, 17 − 3 = ?
Step 1: Use Number bond to split. 17 = 10 + 7
Step 2: Subtract the ones. 7 − 3 = 4
Step 3: 10 + 4 = 14
Step 4: 17 − 3 = 14

For example, 12 − 7 = ?
Step 1: Use Number bond to split. 12 = 10 + 2
Step 2: Subtract the ones. 10 − 7 = 3
Step 3: 2 + 3 = 5
Step 4: 12 − 7 = 5

For example, 69 − 2 = ?
Step 1: Use Number bond to split. 69 = 60 + 9
Step 2: Subtract the ones. 9 − 2 = 7
Step 3: 60 + 7 = 67
Step 4: 69 − 2 = 67

For example, 72 − 8 = ?
Step 1: Use Number bond to split. 72 = 60 + 12
Step 2: 12 − 8 = 4
Step 3: 60 + 4 = 64
Step 4: 72 − 8 = 64

Singapore Math subtraction using number bonds
Example:
Subtract a One-Digit Number from a Two-Digit Number - Subtraction using number bonds
19 − 6 = ?
13 − 2 = ?
17 − 7 = ?
14 − 3 = ?

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Examples of subtraction using number bonds
17 − 3 = ?
12 − 4 = ?
16 − 8 = ?
14 − 6 = ?
18 − 9 = ?
13 − 5 = ?

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Singapore Math subtraction using number bonds (word problems)
Examples:
1) Jane has 17 gel pens. She gave away 4 gel pens to her friend. How many gel pens is Jane left with?
2) Joyce has 18 toy cars. She gave away 5 of them. How many does Joyce have left?

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Subtracting Tens

For example, 95 − 40 = ?
Step 1: Use Number bond to split. 95 = 90 + 5
Step 2: 90 − 40 = 50
Step 3: 50 + 5 = 55
Step 4: 95 − 40 = 55

Subtracting Tens and Ones

For example, 78 − 24 = ?
Step 1: Use Number bond to split. 78 = 70 + 8, 24 = 20 + 4
Step 2: Subtract the tens. 70 − 20 = 50
Step 3: Subtract the ones. 8 − 4 = 4
Step 4: 50 + 4 = 54
Step 4: 78 − 24 = 54

For example, 74 − 28 = ?
Step 1: Use Number bond to split. 74 = 60 + 14, 28 = 20 + 8
Step 2: Subtract the tens. 60 − 20 = 40
Step 3: Subtract the ones. 14 − 8 = 6
Step 4: 40 + 6 = 46
Step 4: 72 − 28 = 46

Subtraction with Number Bonds and the Arrow Way
Example:
56 - 30

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Singapore Math Grade 1A Subtraction
How to subtract a single digit number from a two digit number that has a number in the ones place smaller then the value being subtracted
Example:
11 − 3 = ?

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