Compare numbers in the range 100000

**Lesson 1:** Number ?

__Solution guide:__

- Count up the numbers and fill in the missing numbers in the blanks.
- Count how far the numbers are round hundred or round thousand and then fill in the blank with the appropriate number.

**Lesson 2:** Fill in the blanks with appropriate >, <, = signs

8357… 8257 3000 + 2 … 3200

36 478 … 36 488 6500 + 200 … 6621

89 429 … 89 420 8700 – 700 … 8000

8398 … 10 010 9000 + 900 … 10 000

__Solution guide:__

- Calculate the value of operations.
- A number with fewer digits has a smaller value.
- Numbers with the same number of digits: Compare each pair of digits in the same row in order from left to right.

a) 8357 > 8257 b) 3000 + 2 < 3200

36 478 < 36 488 6500 + 200 > 6621

89 429 > 89 420 8700 – 700 = 8000

8398 < 10 010 9000 + 900 < 10 000

**Lesson 3:** Mental arithmetic

a) 8000 – 3000 = b) 3000 x 2 =

6000 + 3000 = 7600 – 300 =

7000 + 500 = 200 + 8000 : 2 =

9000 + 900 + 90 = 300 + 4000 x 2 =

**Solution guide:**

- Add thousand round numbers: Add thousands and then add 3 zeros to the end of the result.
- Multiply and divide thousandth round numbers by single digit numbers: Multiply or divide thousands by divisor and then add 3 zeros to the end of the result.

a) 8000 – 3000 = 5000 b) 3000 x 2 = 6000

6000 + 3000 = 9000 7600 – 300 = 7300

7000 + 500 = 7500 200 + 8000 : 2 = 4200

9000 + 900 + 90 = 9990 300 + 4000 x 2 = 8300

**Lesson 4:**

a) Find the largest five-digit number

b) Find the smallest five-digit number.

__Solution guide:__

- Write the largest 5-digit number: The value of the digits in each row is 9.
- Write the smallest 5-digit number: The thousands digit value is 1 and the other row’s digits are 0.

a) The largest five-digit number is 99999

b) The smallest five-digit number is 10000.

**Lesson 5:** Calculate then calculate

a) 3254 + 2473 b) 8460 : 6

8326 – 4916 1326 x 3

__Solution guide:__

- Write the calculation
- Calculate in the correct order.

a)

\(\begin{array}{l}

\underline { + \begin{array}{*{20}{c}}

{3254}\\

{2473}

\end{array}} \\

\,\,\,\,\,5727

\end{array}\) \(\begin{array}{l}

\underline { – \begin{array}{*{20}{c}}

{8326}\\

{4910}

\end{array}} \\

\,\,\,\,\,3410

\end{array}\)

b)

\(\begin{array}{l}

\begin{array}{*{20}{c}}

{\,\,\,\,\,8460}\\

{24}

\end{array}\left| {\begin{array}{*{20}{c}}

6\\

\hline

{1410}

\end{array}} \right.\\

\,\,\,\,\,\,\,\,\,06\\

\,\,\,\,\,\,\,\,\,\,00\\

\,\,\,\,\,\,\,\,\,\,\,\,\,\,0

\end{array}\) \(\begin{array}{l}

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

{1326}\\

{\,\,\,\,\,\,\,\,3}

\end{array}} \\

\,\,\,\,\,3978

\end{array}\)

.

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