Math 2 Lesson: Liters
1.1. Knowledge to remember
The pitcher holds more water than the cup.
The cup holds less water than the pitcher.
Pour milk to fill the shift, we get 1 liter of milk.
Abbreviated liter is
1.2. Math forms
Form 1: Read and write the number of liters
– Read numbers and add liter units.
– Write numbers: Write the number and add the unit of liter denoted by l to the end.
Form 2: Calculate
– Perform calculations with numbers
– Write the unit of liters in the result.
(Add and subtract numbers when the same unit of measure is liters)
Form 3: How many liters are left?
To calculate the number of liters remaining after being reduced, you need to subtract the original number of liters from the number of liters poured out.
Form 4: Math Quiz
– Read and analyze the topic.
– Find a solution to the problem: Pay attention to the keywords “remaining”; “all”… to use reasonable calculation.
– Present the solution.
– Check the answer you just found.
1.3. Solve textbook exercises pages 41, 42
Reading and writing:
Read and write the given numbers.
Applying knowledge: “l” is read as liters.
Calculation (according to the form):
a) 9l + 8l = 17l 15l + 5l = 2l + 2l + 6l =
b) 17l – 6l = 18l – 5l = 28l – 4l – 2l =
Do the calculation with the numbers and then write the unit of liters after the result you find.
a) 9l + 8l = 17l 15l + 5l = 20l 2l + 2l + 6l = 10l
b) 17l – 6l = 11l 18l – 5l = 13l 28l – 4l – 2l = 22l
How many liters are left?
Take the number of liters in the can minus the number of liters poured.
b) 10l – 2l = 8l
c) 20l – 10l = 10l.
The first time the store sold 12 liters of fish sauce, the next time it sold 15 liters of fish sauce. How many liters of fish sauce were sold both times?
To find the number of liters of fish sauce sold both times, we take the number of liters of fish sauce sold in the first time plus the number of liters of fish sauce sold in the next time.
The number of liters of fish sauce both times the store sold is
12 + 15 = 27 (l)
Answer: 27 liters.
1.4. Textbook exercise solution page 43
2l + 1l = 15l – 5l = 3l + 2l – 1l =
16l + 5l = 35l – 12l = 16l – 4l + 15l =
Do the calculation with the numbers and then write the unit of liters after the result.
2l + 1l= 3l 15l – 5l = 10l 3l + 2l – 1l = 4l
16l + 5l = 21l 35l – 12l = 23l 16l – 4l + 15l = 27l
Sum the numbers given in each figure and fill in the blanks with the result.
a) 1l + 2l + 3l = 6l; b) 3l + 5l = 8l; c) 10l + 20l = 30l.
The first tank has 16 liters of oil, the second one has 2 liters less oil than the first one. How many liters of oil are in the second barrel?
First barrel: 16l
The second barrel is less than the first one: 2l
Second barrel: … liters?
To find how many liters of oil in the second barrel, subtract 2 liters of oil from the number of liters of oil in the first barrel.
The second barrel has the number of liters of oil:
16 – 2 = 14 (l)