Mary left London at 12:45 and arrived in Birmingham at 15:55. How long did her journey take?
2. Fred started playing a computer game at 14:35.
He played for 40 minutes. At what time did he finish?
3. Georgina put a cake in the oven. It took 45 minutes to cook.
She took it out at 12:35. At what time did she put it in?
4. A bus left Chichester at 08:50 and arrived in Brighton at 10:55.
How long did the journey take?
5. Harry set his DVD recorder to begin recording at 13:30
and to stop recording at 15:20.
How long was the programme he was recording?
6. The Moon rose at 11:47 and set at 23:50.
For how long was the Moon visible in the sky?
For how long was it not visible?
7. Farzin ran a 100m in 22.4 seconds.
Franz ran a 100m in 23.7 seconds.
How much quicker did Farzin run the distance?
8. Mary, Ali, Peter and Mick belonged to a rifle club. They each fired four
rounds. Here are their times:
Mary 87.3 seconds
Ali 88.4 seconds
Peter 92.7 seconds
Mick 85.6 seconds
Who was the quickest?
By how much was Ali quicker than Peter?
What was their total time?
9. By how much is 37.8 seconds shorter than 56.5 seconds?
10. How long is it from 12:56 on Monday to 13:58 on Thursday?
Пошаговое объяснение:
1) Сторона квадрата 5 см
Квадрат можно разрезать на 25 квадратов со стороной 1 см и построить 2 квадрата .Один будет со стороной 3 см , а второй будет со стороной 4 см.
Площадь исходного квадрата
S=5²= 25 cм²
Площади новых квадратов будут
S₁=4²= 16 cм²
S₂=3²=9 см²
Как видим мы получили два числа , которые являются квадратами натуральных чисел 3 и 4 .
S=S₁+S₂
25=9+16
25=25
ответ: можно
2) Сторона квадрата 6 см
Площадь квадрата будет
S=6²= 36 см²
Данный квадрат нельзя разрезать на несколько частей и составить из них 2 новых квадрата , длина сторон которых выражаются целым числом. Поскольку число 36 нельзя записать как сумму двух чисел , которые являются квадратами натуральных чисел.
ответ : нельзя