最新牛津深圳版初中英语七年级上册Unit 4 The world of numbers 课件
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writing numbers. 2.The Egyptians first invented the 1 to 9
system of numbers. 3.The zero is not a number. 4.The zero is an especially important number. 5.Machines make it easier for us to calculate. 6.Your brain is an important part of your body.
Skimming
1. Title: _N_u_m__b_e_rs_:_E_v_er_y_o_n_e_’s_l_a_n_guage 2. Headings: ___A_n_c_ie_n_t__n_u_m_bers
__________Z_e_r_o ________ca_l_c_u_la_ting machines
Intensive reading: the first 2 parts.
1.How did people in ancient times count in the
same way?
They nearly all counted in
tens .
2. Which system of numbers did the Indians
2. 4.63 (four point six three ) is a decimal number.
Question: Which of the following is a decimal numbers? A. 0.82 B. 5/8 Care fractions.
The world of numbers
Competition
about numbers
VS
1.2, 4, 6, 8…are even numbers, and 1, 3, 5, 7, 9…are odd numbers.
Question: 10 is an even number and 45 is an odd number.
45 ÷ 9= 5
8. 0.5 equals ½. What does “equal” mean?
to be the same with =
9. 700 means 70 degrees. 900 means ?
10. ½ is 50 percent.
Question: 68% is a
.
A. Percentage B. fraction C. decimal number
A What do you know about…
j 1 a demical number i 7 multiply, times
f 2 a pair of odd
d 8 divide
numbers c 3 a fraction
h 9 a number showing degrees
b 4 zero
Question: what is 10 minus 5?
10-5= 5
6. Two times three is six. Two multiplied by three makes 6.
２× ３ ＝６ Question: What is 20 times 8?
20 × 8= 160
7. 30 divided by 6 is 5. Question: what is 45 divided by 9?
Question: what does “fraction” mean? A. 分数 B.度数 c. 小数
4. 3 plus 5 is 8. Question: what is 3 plus 3?
3+3= 6
5. Three subtracted from twelve is nine. . Twelve minus three is nine.
invented? The system of 1
to 9 .
3. What invention helped people write in big
numbers? The invention of zero .
Calculating machines
A calculating machine with wires and beads. An abacus
A small machine that uses electronic power to do calculations. An electronic calculator
A very powerful machine for doing calculation. A computer
an abacus
1. Features (特点）:
wires
fast & accurate 2. What does beads on the
wires stand for?
3. Figure: 5 7 2 4
thousands
hundreds
tens
ones
beads
Guess----
The text is about the ____h_i_stoofrynumbers
and the descriptions(描述) of three ________ c_a_lc_u_la_t_in_g.machines
Before reading: Exercise B 1.Long ago, there were different ways of
k 10 a percentage
a 5 add; plus
g 11 a pair of numbers
l 6 subtract; minus e 12 equals
Numbers: Everyone’s language
How many languages do you know?
我每天早上7点钟起床。 I get up at 7:00 every morning. 私は每朝 7时に起きます。 numbers: International language
system of numbers. 3.The zero is not a number. 4.The zero is an especially important number. 5.Machines make it easier for us to calculate. 6.Your brain is an important part of your body.
Skimming
1. Title: _N_u_m__b_e_rs_:_E_v_er_y_o_n_e_’s_l_a_n_guage 2. Headings: ___A_n_c_ie_n_t__n_u_m_bers
__________Z_e_r_o ________ca_l_c_u_la_ting machines
Intensive reading: the first 2 parts.
1.How did people in ancient times count in the
same way?
They nearly all counted in
tens .
2. Which system of numbers did the Indians
2. 4.63 (four point six three ) is a decimal number.
Question: Which of the following is a decimal numbers? A. 0.82 B. 5/8 Care fractions.
The world of numbers
Competition
about numbers
VS
1.2, 4, 6, 8…are even numbers, and 1, 3, 5, 7, 9…are odd numbers.
Question: 10 is an even number and 45 is an odd number.
45 ÷ 9= 5
8. 0.5 equals ½. What does “equal” mean?
to be the same with =
9. 700 means 70 degrees. 900 means ?
10. ½ is 50 percent.
Question: 68% is a
.
A. Percentage B. fraction C. decimal number
A What do you know about…
j 1 a demical number i 7 multiply, times
f 2 a pair of odd
d 8 divide
numbers c 3 a fraction
h 9 a number showing degrees
b 4 zero
Question: what is 10 minus 5?
10-5= 5
6. Two times three is six. Two multiplied by three makes 6.
２× ３ ＝６ Question: What is 20 times 8?
20 × 8= 160
7. 30 divided by 6 is 5. Question: what is 45 divided by 9?
Question: what does “fraction” mean? A. 分数 B.度数 c. 小数
4. 3 plus 5 is 8. Question: what is 3 plus 3?
3+3= 6
5. Three subtracted from twelve is nine. . Twelve minus three is nine.
invented? The system of 1
to 9 .
3. What invention helped people write in big
numbers? The invention of zero .
Calculating machines
A calculating machine with wires and beads. An abacus
A small machine that uses electronic power to do calculations. An electronic calculator
A very powerful machine for doing calculation. A computer
an abacus
1. Features (特点）:
wires
fast & accurate 2. What does beads on the
wires stand for?
3. Figure: 5 7 2 4
thousands
hundreds
tens
ones
beads
Guess----
The text is about the ____h_i_stoofrynumbers
and the descriptions(描述) of three ________ c_a_lc_u_la_t_in_g.machines
Before reading: Exercise B 1.Long ago, there were different ways of
k 10 a percentage
a 5 add; plus
g 11 a pair of numbers
l 6 subtract; minus e 12 equals
Numbers: Everyone’s language
How many languages do you know?
我每天早上7点钟起床。 I get up at 7:00 every morning. 私は每朝 7时に起きます。 numbers: International language