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Stretch (not recorded)From Sun 18 October, any time1 / 4
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NameDate
1 · Buses for the trip [social studies: school trip]
Source 1
The fourth graders (made-up) go on a school trip. A bus holds 45 people. One bus costs 52,000 yen.
class
Class 1
Class 2
Class 3
Class 4
students
36
35
37
33
Source 2 — number of students (made up)
Question 1 is already done for you
Classes 1 and 2, 71 students, ride the buses. How many buses?
71 ÷ 45 = 1 remainder 26 (45 × 1 = 45, 71 − 45 = 26)
The 26 left over must ride too → 1 + 1 = 2 buses
2Round each class to the nearest ten and estimate how many students there are in all. Then work out the exact total too.
Look at the ones: 5 to 9 goes up, 0 to 4 stays.
3Someone says: "The estimate is 150. The real number, 141, is less than that, so 3 buses are enough." Is that right? Say why.
Work out 141 ÷ 45. What happens to the ones left over?
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Stretch (not recorded)From Sun 18 October, any time2 / 4
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NameDate
2 · Moon shapes and time in the sky [science: the moon]
Source 1
In one place (made-up) the times when the moon rises and sets were recorded. The moon's shape goes through a whole cycle in about 30 days.
shape
new moon (not seen)
half moon
full moon
days since new moon
day 0
day 7
day 14
moonrise
6:10 am
noon
5:50 pm
moonset
5:50 pm
11:40 pm
6:20 am next day
Source 2 — moonrise and moonset (made-up numbers)
Question 4 is already done for you
On the new-moon day, how long is the moon in the sky?
6:10 am → noon is 5 h 50 min, noon → 5:50 pm is also 5 h 50 min.
5 h 50 min + 5 h 50 min = 11 h 40 min
5On the night of the full moon, how long is the moon in the sky?
Split it: 5:50 pm → midnight → 6:20 am.
6Someone says: "The moon rises about 30 minutes later each day." Use the sources to decide whether that is right.
Compare moonrise on day 0 and day 14. Change it to minutes and divide by 14.
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Stretch (not recorded)From Sun 18 October, any time3 / 4
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NameDate
3 · The gym's electricity bill [social studies: electricity]
Source 1
The electricity bill of a school gym (made-up), month by month. The gym has 48 lights.
Source 2 — the gym's electricity bill. Brackets show the days in the month. The numbers are made up.
Question 7 is already done for you
How many yen per day in June?
June has 30 days → 37,800 ÷ 30
To divide by 30, divide by 10 and then by 3: 3,780 ÷ 3 = 1,260 yen
8How many yen per day in July? First treat 52,700 as 50,000 and 31 as 30 and write "about how much". Then work out the answer in long division.
Check that the answer is close to your guess.
9Someone says: "Even if you triple August's cost per day, it does not reach July's cost per day." Is that right? Explain with numbers.
Divide August by 31, multiply by 3, and compare with July.
10 minutes a sheet, then stop
Stretch (not recorded)From Sun 18 October, any time4 / 4
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NameDate
4 · How often the heart beats [science: the human body]
Source 1
A wrist device counted the pulse of a 10-year-old (made-up). The pulse count is the same as the number of heartbeats.
when
resting
after walking
after running
time measured
15 min
3 min
2 min
pulse count
1,080
270
324
Source 2 — pulse counts (made-up numbers)
Question 10 is already done for you
While resting, how many beats per minute?
1,080 ÷ 15 = 72 (15 × 70 = 1,050, the other 30 is 15 × 2)
Answer: 72 beats a minute
11Suppose the resting rate lasted a whole day (24 hours). How many heartbeats in a day? Then round it to the nearest ten thousand.
1 hour is 60 minutes. Find the beats in 1 hour, then times 24. Look at the thousands to round.
12Someone says: "After running, the pulse per minute is more than twice the resting pulse." Is that right? Explain with numbers.
Divide the running figure by 2 minutes. Double the resting figure.
kids/learn — weekly worksheet. The answers have a page of their own.