Review numbers up to 100 000

### 1.1. Review numbers up to 100 000

**Lesson 1 page 169:** Write the correct numbers on each line

**Solution guide:**

- Count down to 10,000 units and fill in the blanks with the missing number.
- Count down 5,000 units and then fill in the missing number.

**Lesson 2 page 169:** Read the numbers : 36 982 ; 54 175 ; 90 631 ; 14 034 ; 8066 ; 71 459 ; 48 307 ; 2003 ; 10 005 (according to the form).

*Template:* 36 982 read as thirty-six thousand nine hundred and eighty-two.

__Solution guide:__

- Read numbers in the order of rows from left to right, paying attention to the case of numbers with the unit digit equal to 4; 5.

+ 54 175 read as fifty-four thousand one hundred and seventy-five.

+ 90 631 read as ninety thousand six hundred thirty one.

+ 14 034 read as fourteen thousand zero hundred thirty-four.

+ 8066 read as eight thousand zero hundred and sixty-six.

+ 71 459 read as seventy-one thousand four hundred and fifty-nine

+ 48 307 read as forty-eight thousand three hundred and seven.

+ 2003 read as two thousand zero hundred and three.

+ 10 005 reads as ten thousand zero hundred and five.

**Lesson 3 page 169: **

a) Write the numbers 9725, 6819, 2096, 5204, 1005 (according to the form)

*Template:* 9725 = 9000 + 700 + 20 + 5

b) Write the following sums in the form

4000 + 600 + 30 +1 7000 + 500 + 90 + 4

9000 + 900 + 90 + 9 9000 + 90

9000 + 9

*Template:* 4000 + 600 + 30 +1 = 4631

__Solution guide:__

- Write the number as the sum of thousands, hundreds, tens, and units.
- Write the sum to the corresponding four-digit numbers.

a) 6819 = 6000 + 800 + 10 + 9

2096 = 2000 + 90 + 6

5204 = 5000 + 200 + 4

1005 = 1000 + 5

b) 4000 + 600 + 30 +1 = 4631 7000 + 500 + 90 + 4 = 7594

9000 + 900 + 90 + 9 = 9999 9000 + 90 = 9090

9000 + 9 = 9009

**Lesson 4, page 169:** Write the correct number in the dot

a) 2005; 2010; 2015; … ; … .

b) 14300; 14400; 14500; … ; … .

c) 68000; 68010; 68020; … ; … .

__Solution guide:__

- Count the number of ways in ascending order and then fill in the missing number in the blank.

a) 2005; 2010; 2015; 2020; 2025

b) 14300; 14400; 14500; 14600; 14700

c) 68000; 68010; 68020; 68030; 68040.

### 1.2. Review numbers up to 100 000 (continued)

**Lesson 1 page 170:** Enter the sign >; < or = suitable for the dot

27 469 … 27 470 70000 + 30000 … 99 000

85 100 … 85 099 80000 + 10000 … 99 000

30 000 … 29000+ 1000 90000 + 9000 … 99 000

__Solution guide:__

- Find the value of the sides with addition.
- Compare pairs of numbers in the same row in order from left to right.

27 469 < 27 470 70000 + 30000 > 99 000

85 100 > 85 099 80000 + 10000 < 99 000

30 000 = 29000 + 1000 90000 + 9000 = 99 000

**Lesson 2 page 170:** Find the largest of the following numbers

a) 41 590; 41 800; 42 360; 41 785

b) 27 898; 27 989; 27 899; 27 998

__Solution guide:__

- Compare pairs of numbers in the same row in order from left to right.
- Find the number with the largest value.

a) We have: 41590 < 41785 < 41800 < 42360.

The largest of the given numbers is: 42360.

b) We have: 27 898 < 27 899 < 27 989 < 27 998.

The largest of the given numbers is: 27998.

**Lesson 3 page 170: **Write the numbers 69725; 70 100; 59 825; 67 925 in order from baby to adult

__Solution guide:__

- Compare pairs of numbers in the same row in order from left to right.
- Sort the numbers in ascending order.

The numbers given in order from smallest to largest are:

59 825; 67 925; 69 725; 70 100.

**Lesson 4 page 170:** Write the numbers 64 900; 46 900; 96 400; 94 600 in order from big to small

__Solution guide:__

- Compare pairs of numbers in the same row in order from left to right.
- Sort the numbers in descending order.

The numbers given in order from largest to smallest are:

96 400; 94 600; 64 900; 46 900

**Lesson 5 page 170:** Circle the word in front of the correct answer

In which line are the three numbers written in order from smallest to largest?

A. 2935; 3914; 2945 C. 8763; 8843; 8853

B. 6840; 8640; 4860 D. 3689; 3699; 3690

__Solution guide:__

- Compare pairs of numbers in the same row in order from left to right.
- Sort the numbers in ascending order.

*Solution :*

We have: 8763 < 8843 < 8853.

Circle the letter C.

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