Math 2 Lesson: 36 + 15
1.1. Knowledge to remember
Set and calculate: 36 + 15
6 plus 5 equals 11, write 1, remember 1.
3 plus 1 equals 4, add 1 equals 5, write 5.
So 36 + 15 = 51
1.2. Math forms
Form 1: Set the calculation and then calculate
– Set alignment.
– Perform addition operations, taking units plus units, tens plus tens, respectively.
– With memory addition, I add 1 unit to the tens.
Form 2: Build the math and find the result.
– Write calculations according to the data of the given problem.
– Perform calculations to find the value of the result.
Form 3: Math Quiz
– Read and analyze the problem carefully, identify known and unknown numbers.
– Find a way to solve the problem, pay attention to the solution of the “more” form of math; “less” just learned.
– Present the lesson and check the results just found.
1.3. Textbook Exercises Page 36
Lesson 1
Calculate:
Solution method
Perform addition of numbers from right to left.
Solution guide
Lesson 2
Set the calculation and then sum, knowing the terms are:
a) 36 and 18; b) 24 and 19; c) 35 and 26.
Solution method
– Set calculation: Write the digits in the same row and column together.
– Calculation: Add the numbers from right to left in turn.
Solution guide
lesson 3
Solve the problem according to the following figure:
Solution method
To calculate the weight of both bags of rice and bags of corn, we take the weight of the bag of rice plus the weight of the bag of corn.
Solution guide
Both bags weigh in kilograms:
46 + 27 = 73 (kg)
Answer: 73kg.
Lesson 4
Which ball does the calculation with the result of 45?
Solution method
– Perform addition of numbers.
– Select the calculation with the value of 45.
Solution guide
We have :
5 + 35 = 40; 40 + 5 = 45;
18 + 27 = 45; 36 + 9 = 45.
The balls with the calculation result of 45 include: 2nd ball (40+5), 3rd ball (18+27), 4th ball (36+9) (from left to right).
1.4. Solve the textbook exercises page 37
Lesson 1
Mental arithmetic:
6 + 5 = 6 + 6 = 6 + 7 = 6 + 8 =
5 + 6 = 6 + 10 = 7 + 6 = 6 + 9 =
8 + 6 = 9 + 6 = 6 + 4 = 4 + 6 =
Solution method
Perform the addition of numbers in the learned range and then fill in the blank with the result.
Solution guide
6 + 5 = 11 6 + 6 = 12
6 + 7 = 13 6 + 8 = 14
5 + 6 = 11 6 + 10 = 16
7 + 6 = 13 6 + 9 = 15
8 + 6 = 14 9 + 6 = 15
6 + 4 = 10 4 + 6 = 10
Lesson 2
Write the correct number in the blank:
Rank 
26 
17 
38 
26 
15 
Rank 
5 
36 
16 
9 
36 
total 




Solution method
Add the two given terms in order of numbers from units to tens and then fill in the result in the appropriate box.
Solution guide
Rank 
26 
17 
38 
26 
15 
Rank 
5 
36 
16 
9 
36 
total 
41 
53 
54 
35 
51 
lesson 3
Number?
Solution method
– Take the number in the first row, plus 6 to get the value of the corresponding cell in the second row.
– Continue to take the number you just found plus 6 to get the number to fill in the corresponding box in the third row.
Solution guide
Lesson 4
Solve the problem according to the following summary:
Solution method
To find the number of plants planted by team 2, we take the number of plants planted by team 1 plus 5.
Solution guide
The number of plants that team 2 can plant is:
46 + 5= 51 ( tree )
Answer: 51 trees.
Lesson 5
In the figure below:
a) How many triangles are there?
b) How many quadrilaterals are there?
Solution method
– Count single shapes.
– Match the picture and then count until the end.
Solution guide
Number the picture and then count:
a) There are 3 triangles: h1, h3, h (1,2,3)
b) There are 3 quadrilaterals: h2, h(1,2), h(2,3)
.
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