Math 2 Lesson: 55 – 8; 56 – 7; 37 – 8; 68

### 1.1. Knowledge to remember

### 1.2. Math forms

**Form 1: Calculate**

– Set alignment.

– Perform subtraction in turn from right to left, when the unit row of the number being subtracted is not enough to subtract, you need to perform the subtraction with memory.

**Form 2: Find unknown value – Find x.**

To find the unknown term, subtract the known term from the sum.

– To find the number to be subtracted unknown, we take the difference plus the minus number.

**Form 3: Math Quiz**

– Read and analyze the topic

– Find the solution of the problem: Notice that the problem has the keywords “reduce”; “remaining”… usually uses subtraction to find the solution.

– Presentation of the problem.

– Check the answers and results you just found

### 1.3. Solving Textbook Exercises

**Lesson 1**

Calculate:

__Solution method__

Perform the subtraction and then fill in the blank with the result.

__Solution guide__

**Lesson 2**

Find x:

a) x + 9 = 27

b) 7 + x = 35

c) x + 8 = 46

__Solution method__

To find a term we subtract the other term from the sum.

__Solution guide__

a) x + 9 = 27

x = 27 – 9

x = 18

b) 7 + x = 35

x = 35 – 7

x = 28

c) x + 8 = 46

x = 46 – 8

x = 38

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