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Each gold coin is 5 mm thick, and each silver coin is 2 mm thick. A stack of 148 gold coins and 216 silver coins is about ___________ cm thick.

Height of gold coin = 5 mm
Silver coin height = 2 mm
Height of 148 gold and 216 silver coins = 148 x 5 mm + 216 x 2 mm = 740 + 432 mm = 1172 mm = 1172/10 cm = 117.2 cm ( 1 cm = 10 mm)

John is 15 years old. His father is 45 years 9 months old. Find the difference between their ages.

Difference in ages = 45 years 9 months – 15 years.
= 30 years 9 months.

Brenda is 12 years 6 months old and Patty is 12 years 8 months old. Their total age is _________.

Brenda = 12 years 6 months
Patty = 12 years 8 months
Total age = 12 yr 6 mnth + 12 yr 8 mnth= 24 years 14 months.
12 months = 1 year.
14 months = 1 years 2 months.
Total age= 25 years 2 months.

Jack is an athlete. During his daily training, Jack hops along a path that is 35 yards long. If he can hop forward 15 inches each time, ________hops he can make along the path.

1 yard = 36 inches.
35 yards = 35 x 36 inches.
Number of hops he needs to make to complete the track = 35 x 36 / 15= 84 hops.

Leo ran 4 times around a circular track and did 100 jumping jacks. He ran a total of 2.4 km. __________meters long are one complete circuit of the track.

2.4 km = 4 x length of track.
Length of track = 2.4 / 4= 0.6 km = 600 metres. ( 1 km = 1000 m)

6 feet of packing tape is needed to seal a shipping box. __________boxes can be sealed with 44 yards of packing tape.

1 yard = 3 feet
44 yards = 3 x 44 = 132 feet.
6 feet required for 1 box.
132 feet can seal 132 /6 boxes = 22 boxes

A paper manufacturing company produces 70 tons of paper every hour. The weight of the paper produced per hour (in pounds) is _____.

1 ton = 2000 pounds
70 tons = 70 x 2000 pounds = 140000 pounds.

Animal experts say that a hippo can weigh up to 16000 pounds. The weight in tons is __________.

1 pound = 1/2000 tons.
16000 pounds = 16000 x 1/ 2000= 8 tons.

Ashley's teacher asked her to bring 3 pieces of yarn, each no shorter than 0.8 m, for an art project. Ashley found a piece of old yarn at home that is 280 cm long. Does she have enough yarn to bring to school?

230 erasers = 230 x 17 mm =3910 mm = 3.910 m ( 1 m = 1000 mm)

Difference in time from 7 : 15 pm to 10 : 45 pm = 3 hr 30 mins.=3:30
Length of 1 yarn = 0.8 m
Length of 3 yarns = 3 x 0.8 = 2.4 m= 240 cm ( 1 m = 100 cm)
Ashley has 280 cm of yarn, which is more than 240 cm . hence, she does have enough yarn to bring to school.

_______ hours are there from 10:45 p.m. to 7:15 p.m.

Difference in time from 7 : 15 pm to 10 : 45 pm = 3 hr 30 mins.=3:30

The thickness of each eraser is 17 mm. A stack of 230 erasers is about ___________ meters tall.

1 eraser = 17 mm
230 erasers = 230 x 17 mm =3910 mm = 3.910 m ( 1 m = 1000 mm)

A turtle crawls 567 mm in 27 minutes. The distance (measured in cm) the turtle can crawl in a minute is_______.

Turtle travels 567 mm in 27 mins
In 1 minute, it’ll travel 567/27 = 21 mm = 2.1 cm ( 10 mm = 1 cm)