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"Into the Planetarium" PPT Courseware 2
1. Situation introduction
Today is Thursday, November 19th.
December 5th is Xiaohua’s birthday.
What day of the week is December 5th?
What mathematical information do you know from the picture?
What questions can you ask based on this information?
2. Cooperation and exploration
What day of the week is December 5th?
Calculate based on period:
Find the cycle There are 7 days in a week, which can be regarded as a cycle.
Count the number of days. How many days are there from November 19th to December 5th?
30 – 19 + 5 = 16 (days)
Column formula 16÷7＝2 (weeks) 2 (days)
Look at the remainder. Two days from Thursday are Saturdays, so December 5th is Saturday.
3. Independent practice
1. July 25, 2015 is a Saturday. What day of the week is August 13th?
31 – 25 + 13 = 19 (days)
19÷7=2 (weeks)······5 (days)
Count 5 days from Saturday: Sunday, Monday, Tuesday, Wednesday, Thursday.
Answer: August 13th is Thursday.
2. "Three days for fishing, two days for drying nets" is the work and rest pattern of ancient fishermen. How many days are spent fishing in 60 days?
First calculate how many cycles there are in 60 days (a cycle of 5 days).
60 ÷ (3 + 2) = 12 (pieces)
Then calculate how many days of fishing there are in 60 days (three days of fishing in one cycle).
12 × 3 = 36 (days)
Answer: Out of 60 days, I fished 36 days.
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"Into the Planetarium" PPT courseware 5:
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"Into the Planetarium" PPT courseware 4:
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