Practice drawing diagrams 1.1. Solving textbook exercises on pages 1373, 174, 175 Lesson 1 Textbook page 173 To show the number of trees planted by each student in the GREEN group in the school garden, the chart below can be used: Based on the chart, answer the following questions: a) How many students plant trees? How many trees can each student plant? b) … [Read more...] about Practice drawing diagrams

# Grade 5 Math

## Some types of math problems learned

Some types of math problems learned 1.1. Knowledge to remember Find the average number. Find two numbers whose sum and difference are the same. Find two numbers whose sum and ratio are the same. Find the difference of two numbers and their ratio. The problem is related to unit withdrawal. The problem of percentages. The problem of uniform motion. The … [Read more...] about Some types of math problems learned

## Review on calculating area and volume of some shapes

Review on calculating area and volume of some shapes 1.1. Knowledge to remember \(\begin{array}{l}{S_{xq}} = \left( {a \times b} \right) \times 2 \times c\\{S_{tp}} = {S_{xq}} + {S_{day}} \times 2\\V = a \times b \times c\end{array}\) \(\begin{array}{l}{S_{xq}} = a \times a \times 4\\{S_{tp}} = a \times a \times 6\\V = a \times a \times a\end{array}\) 1.2. … [Read more...] about Review on calculating area and volume of some shapes

## Reviewing the perimeter and area of some shapes

Reviewing the perimeter and area of some shapes 1.1. Knowledge to remember 1) Rectangle P = (a + b) × 2 S = a × b 2) Triangle \(S = \frac{{a \times h}}{2}\) 3) Square P = a × 4 S = a × a 4) Trapezoid \(S = \frac{{(a + b) \times h}}{2}\) 5) Parallelogram S = a × h 6) Rhombus \(S = \frac{{m \times n}}{2}\) 7) Round shape C = r × … [Read more...] about Reviewing the perimeter and area of some shapes

## Reviewing calculations with time measurements

Reviewing calculations with time measurements 1.1. Solve textbook exercises on page 165,166 Lesson 1 Textbook page 165 Calculate a) 12 hours 24 minutes + 3 hours 18 minutes b) 5.4 hours + 11.2 hours 14 hours 26 minutes - 5 hours 42 minutes 20.4 hours - 12.8 hours Solution guide: a) b) Lesson 2 Textbook page 165 Calculate a) 8 minutes 54 seconds x … [Read more...] about Reviewing calculations with time measurements

## Practice division

Practice division 1.1. Solving exercises in the Practice Textbook Page 164, 165 Lesson 1 Textbook page 164 Calculate a) \(\frac{{12}}{{17}}:6;\,\,\,16:\frac{8}{{11}};\,\,9:\frac{3}{ 5} \times \frac{4}{{15}}\) b) 72:45 281.6:8 300.72:53.7 15:50 912.8:28 0.162:0.36 Solution guide: a) \(\frac{{12}}{{17}}:6 = \frac{{12}}{{17}} \times \frac{1}{6} = \frac{{12}}{ … [Read more...] about Practice division

## Division

Division 1.1. Knowledge to remember a) In divisibility Note: There is no division by zero. a:1=aa:first=a a:a=1a:a=first (aa other than 00) 0:b=00:b=0 (bb other than 00) b) In division there is remainder Note: The remainder must be less than the divisor. 1.2. Solving textbook exercises on pages 163, 164 Lesson 1 … [Read more...] about Division

## Multiplication

Multiplication 1.1. Knowledge to remember Multiplication of natural numbers, fractions, and decimals all have the following properties: Commutative properties: a×b=b×a Combined properties: (a×b)×c=a×(b×c) Multiply a sum by a number: (a+b)×c=a×c+b×c Multiplication with a … [Read more...] about Multiplication

## Practice addition and subtraction

Practice addition and subtraction 1.1. Solving exercises in the textbook Practice pages 160, 161 Lesson 1 Textbook page 160 Calculate \(\begin{array}{l}a)\frac{2}{3} + \frac{3}{5};\frac{7}{{12}} - \frac{2}{7} + \frac{1}{{12}} ;\frac{{12}}{7} - \frac{5}{{17}} - \frac{4}{{17}}\\b)578.69 + 281.78; 594.72 + 406.38 - 329.47\end{array}\) Solution … [Read more...] about Practice addition and subtraction

## Subtraction

■Subtraction ■ Subtraction . ===== … [Read more...] about Subtraction