Multiply a two-digit number by a single digit (remember)

### 1.1. Knowledge to remember

**a) 26 x 3 = ?**

\(\frac{{ \times \begin{array}{*{20}{c}}

{26}\\

{\,\,\,3}

\end{array}}}{{\,\,\,78}}\)

- 3 times 6 equals 18, write 8 remember 1.
- 3 times 2 equals 6, add 1 equals 7, write 7.

**b) 54 x 6 = ?**

\(\frac{{ \times \begin{array}{*{20}{c}}

{54}\\

{\,\,\,6}

\end{array}}}{{\,324}}\)

- 6 times 4 equals 24, write 4 remember 2.
- 6 times 5 equals 30, add 2 equals 32, write 32.

**Multiplication steps:**

- Set count
- Calculation: From right to left, multiply the second factor by each digit in the units and tens place of the first factor, respectively, remembering the unit product to the tens product.

### 1.2. Solving Textbook Exercises

**Lesson 1:** Calculate

\({\underline { \times \begin{array}{*{20}{c}}

{47}\\

{\,\,2}

\end{array}} }\) \({\underline { \times \begin{array}{*{20}{c}}

{25}\\

{\,\,3}

\end{array}} }\) \({\underline { \times \begin{array}{*{20}{c}}

{16}\\

{\,\,6}

\end{array}} }\) \({\underline { \times \begin{array}{*{20}{c}}

{18}\\

{\,\,4}

\end{array}} }\)

\({\underline { \times \begin{array}{*{20}{c}}

{28}\\

{\,\,6}

\end{array}} }\) \({\underline { \times \begin{array}{*{20}{c}}

{36}\\

{\,\,4}

\end{array}} }\) \({\underline { \times \begin{array}{*{20}{c}}

{82}\\

{\,\,5}

\end{array}} }\) \({\underline { \times \begin{array}{*{20}{c}}

{99}\\

{\,\,3}

\end{array}} }\)

**Solution guide:**

\({\frac{{ \times \begin{array}{*{20}{c}}

{47}\\

{\,\,2}

\end{array}}}{{\,\,94}}}\) \({\frac{{ \times \begin{array}{*{20}{c}}

{25}\\

{\,\,3}

\end{array}}}{{\,\,75}}}\) \({\frac{{ \times \begin{array}{*{20}{c}}

{16}\\

{\,\,6}

\end{array}}}{{\,\,96}}}\) \({\frac{{ \times \begin{array}{*{20}{c}}

{18}\\

{\,\,4}

\end{array}}}{{\,\,73}}}\)

\({\frac{{ \times \begin{array}{*{20}{c}}

{28}\\

{\,\,6}

\end{array}}}{{168}}}\) \({\frac{{ \times \begin{array}{*{20}{c}}

{36}\\

{\,\,4}

\end{array}}}{{144}}}\) \({\frac{{ \times \begin{array}{*{20}{c}}

{82}\\

{\,\,5}

\end{array}}}{{410}}}\) \({\frac{{ \times \begin{array}{*{20}{c}}

{99}\\

{\,\,3}

\end{array}}}{{297}}}\)

**Lesson 2:** Each coil of fabric is 35m long. How many meters long are 2 such rolls of fabric?

**Solution guide:**

*Summary*

Each roll of fabric length:

Two long rolls of fabric: …

?*Solution*

The two long rolls of fabric are:

Answer:

$70$meters

**Lesson 3:** Find x

a) x : 6 = 12; b) x : 4 = 23

**Solution guide:**

To find the divisor we take the merchant with the divisor

a) x : 6 = 12

x = 12 x 6

x = 72

b) x : 4 = 23

x = 23 x 4

x = 92

.

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