Hi Year 5,

this half term’s maths challenges link to our rivers topic.

Bronze

The River Nile is 4132 miles long – round to the nearest 1000, 100 or 10.

Where are the coldest waters in the world? Find the location of the coldest waters around the world and identify the average temperature. Put the waters in order.

Silver

Calculate the temperature of the Pacific Ocean and calculate the temperature differences of this throughout the year e.g. the maximum and minimum temperatures.

Locate the 3 deepest oceans and calculate the combined depth of these in metres and km etc.

Gold

The Atlantic Ocean covers approximately 106,400,000 square kilometres which is 20% of the Earth’s surface, how many square kilometres is the Earth’s surface?

Good luck!

I’m doing mine on paper and i’m going to hand it in to Miss Matharni.

Bronze

For the first answer it is 4000

The second answer is 4100

The last answer is 4130

4132 rounded to the nearest 10 is 4130

4132 rounded to the nearest 100 is 4130

4132 rounded to the nearest 1000 is 4000

BRONZE

1.IS 4000 MILES

2.IS 4100 MILES

3.Is 4130 miles

Bronze

4132 runded nearest 10=4130

4132 runded nearest 100=4100

4132 runded nearest 1000=4000

BRONZE__________________________________________________________4132 rounded 10 =4130

4132 rounded 100 =4100

4132 rounded 1000 =4000

GOLD

106,400,000 is 20% so if the twenty acts like a two towards hundreds then 5 x 2 is 10 (Now a hundred)

106,400,000 x 5 = 532,000,000.

Bronze

4132 rounded nearest 10 = 4130

4132 rounded nearest 100 = 4100

4132 rounded nearest 1000 = 4000

Gold challenge:

The Atlantic Ocean covers approximately 106,400,000 square kilometres which is 20% of the Earth’s surface. So I multilplied the number 106,400,000 x 5 (because 20 is only a small proportion of a hundred/percenatge: my answer was 532000000 km square. To check the answer I divided 5 by 532000000 and the answer was 106,400,000.

Bronze challenge:

4132 rounded to the nearest 10 is 4130

4132 rounded to the nearest 100 is 4100

4132 rounded to the nearest 1000 is 4000

Silver challenge:

According to my search I found out that surface water temperature

in the Pacific Ocean can vary from -1.4°C (29.5 °F), the freezing point of sea water, in the pole wards areas to about 30 °C (86 °F) near the equator.To find out the difference between -1.4°C and 30 °C we have to subtract therefore the answer is 29.6°C.

The 3 deepest oceans are:

Pacific Ocean (10,924 meters)

Atlantic Ocean (9,219 meters)

Indian Ocean (7,455 meters)

The combined depth of the three oceans is 27,598m.

To find out the answer in kilometers I converted the depth in meteres to kilometers.The answer is 27.598km.

BRONZE

4132

nearest 10: 4130

nearest 100:4100

nearest1000:4000

The Upper Neretva has water of Class I purity and is almost certainly the coldest river water in the world, often as low as 7–8 degrees Celsius in the summer months.

Bronze:

4132 to nearest 10-4130

4132 to nearest 100-4100

4132 to nearest 1000-4000

Bronze

4132 rounded to the nearest 1000 is 4000.

4132 rounded to the nearest 100 is 4100.

4132 rounded ro the nearest 10 is 4130.

Gold

Answer:532,000,000

Bronze

Nearest 10 is 4130

Nearest 100 is 4100

Nearest 1000 is 4000

Coldest water on earth:

Ifrane, Morocco- -11.0F

Vostok Station -128.6F

Silver

Temperature in the Pacific Ocean can vary from -1.4C (freezing point) to about 30C near the equator. The difference of this is 30 – -1.4= 28.6

Depth of Three Ocean:

Pacific Ocean- 10,911meters = 10.911km

Atlantic Ocean- 3,339meters = 3.339km

Indian Ocean: 8,047 meters = 8.047km

Combined Depth: 22,297meters= 22.297km

Gold

106,400,000 is 20%, so 100% would be 106,400,000 x 5= 532, 000,000

Bronze

4132 nearest to 10 is 4130

4132 nearest to 100 is 4100

4132 nearest to 1000 is 4000

Silver-San Diego Bay

January-59

February-60

March-62

April-64

May-67

June-70

July-71

August-72

September-70

October-68

November-65

December-60

72-59=13

The 3 deepest oceans are:

Pacific Ocean-10,924m, 10.924km

Atlantic Ocean-9,219m, 9.219km

Indian Ocean-7,455m, 7.455km

Gold

106,400,000km x 5 = 532,000,000km

Gold challenge

So if the Atlantic Ocean cover approximately 106,400,000 square kilometres which is 20% goes into 100 then 5 times so 20% of the earths surface that means that the square kilometre is 532,000,000km this is the answer I’ve got is 106,400,000x 5=532,000,000km

Bronze challenge

The nearest 10 is = 4130m

The nearest 100 is= 4100m

The nearest 1000 is = 4000m

Silver challenge

Indian Ocean 7455 and 24460

Bronze

1. 4132 to the nearest 10 would be 4130 miles

2.4132 to the nearest 100 would be 4100 miles

3. 4132 to the nearest 1000 would be 4000 miles

10640000 x5 =5320000 gold

4132

Nearest ten is 4130

Nearest hundred is 4100

Nearest thousand is 4000

5 times 160,4000,000= 532,000,000

Gold.

Gold

The Atlantic Ocean covers 106400000 square kilometres that is 20% of the earths surface how muck in kilometres is the whole of the earths surface?

10640000 times by 5 is 532000000 kilometres. That is the earths surface in kilometres.

Gold:

In order to calculate the earths surface we have to times 106,400,000 by 5 as it is 20% of the earths surface.20% is equivalent to 1/5 therefore we have to times it by 5.106,400,000 multiplied by five is 532,000,000 therefore the earth is approximately 532,000,000 square kilometres.

The Earths surface is 510.1 kilometres square

Bronze

Nearest 10 is 4130

Nearest 100 is 4100

Nearest 1000 is 4000

coldest water on earth is considered to be in the depth of ocean and that is Mariana trench.This is because of extreme water pressure .Rest of the ocean stays relatively warm because of earth temperatures.Lowest temp in the trench is _10 cdegree celsius.

4132 round 10 4130

4132 round 100 4100

4132 round 1000 4000

Gold

My answer for gold was 532,000,000 square kilometres.By saying this I mean that I think that the Earth`s surface is approximately 532,000,000. I worked this out by doing a sum which was 20×5. I did this because it is stated that the atlantic ocean covers approximately 106,400,000 square kilometres which is 20% of the earths suface. I knew that 20×5 is 100 so this would make 100%. After this sum, I had to work out 106,400,000×5. Once I had worked this out my answer was 532,000,000. This is how I got my answer as 532,000,000 kilometres squared.

I mean square kilometres.

BRONZE

4132

round to nearest 10 = 4130

round to nearest 100 = 4100

round to nearest 1000 = 4000

The Upper Neretva has water of Class I purity and is almost certainly the coldest river water in the world, often as low as 7–8 degrees Celsius in the summer months.

Silver

Canada-Sydney

January:34 Fahrenheit

February:32 Fahrenheit

March:32 Fahrenheit

April:34 Fahrenheit

May:39 Fahrenheit

June:46 Fahrenheit

July:57 Fahrenheit

August:66 Fahrenheit

September:63 Fahrenheit

October:55 Fahrenheit

November:46 Fahrenheit

December:39 Fahrenheit

The maximum:66 Fahrenheit

The minimum:32 Fahrenheit

The three deepest oceans are:

Pacific Ocean (35,837 Fahrenheit )(10,924 meters)

Atlantic Ocean (30,246 Fahrenheit)(9,219 meters)

Indian Ocean (24,460 Fahrenheit) (7,455 meters)

Bronze

4132 rounded to the nearest 10 equals 4130 miles

4132 rounded to the nearest 100 equals 4100 miles

4132 rounded to the nearest 1000 equals 4000 miles

The coldest river in the world is called The Upper Nevetra.

Silver

Los Angeles

JAN-58

FEB-58

MAR-60

APR-60

MAY-61

JUN-63

JUL-66

AUG-68

SEP-67

OCT-66

NOV-64

DEC-60

Maximum temperature is 68 degree’s

Minimum temperature is 58 degree’s

The difference in temperature is 10 degree’s

The 3 deepest oceans are

Pacific @ 10.924km or 109424m

Atlantic @ 9.219km or 9219m

Indian @ 7.455km or 7455m

Giving a total depth of 27.598km or 27598m

Bronze

4132 rouding to the nearest 10= 4130

4132 rouding to the nearest 100= 412300

4132 rouding to the nearest 1000 = 412300

The coldest river in the world is called nervosa. The temperture is -81.0

Bronze

4132 rouding to the nearest 10= 4130

4132 rouding to the nearest 100= 412300

4132 rouding to the nearest 1000 = 412300

The coldest river in the world is called nerveta

Gold challenge

I got the answer 532000000 because I know 20 goes out to into 100 five times. So I multiplied 106400000 5 times which had got me 532000000.

Bronze

4132 rounded to the nearest thousand is 4000

4132 rounded to the nearest 100 equals 4100

4132 rounded to the nearest 10 equals is 4130

Gold

Answer : 212,800,000

GOLD

Earth’s surface is y

20/100 X y = 106,400,000

y = 100/20 X 106,400,000

y = 5 X 106,400,000

y = 532,000,000

Silver

Pacific Ocean Temperature In San Francisco in °F

J F M A M J J A S O N D

52 53 54 55 56 57 60 61 60 58 57 53

Difference = maximum – minimum

Difference = 61-52 = 9 °F

Depth of three oceans

Pacific Ocean10,924 meters = 10.924km

Atlantic Ocean 9,219 meters = 9.219km

Indian Ocean 7,455 meters = 7.455km

Total: 27598m = 27.598km

Bronze

4132 to nearest 10=4130

4132 to nearest 100=4100

4132 to nearest 1000=4000

The answer to the first one is 4000

The answer to the second one is 4100

THE answer to the third one is 4130

BRONZE challenge :)

Bronze

4132 rounded to the nearest thousand is 4000

4132 rounded to the nearest 100 equals 4100

4132 rounded to the nearest 10 equals is 4130

Silver

Average temperature: 63.75 Fahrenheit

January and February:14 Fahrenheit

March:13 Fahrenheit

April:14 Fahrenheit

May:15 Fahrenheit

June:12 Fahrenheit

July:12 Fahrenheit

August:14 Fahrenheit

September:15 Fahrenheit

October:16 Fahrenheit

November:13 Fahrenheit

December:14 Fahrenheit

Gold

Answer : 212,800,000

Bronze

4132 rounded to the nearest thousand is 4000

4132 rounded to the nearest 100 equals 4100

4132 rounded to the nearest 10 equals is 4130

Silver

Average temperature: 63.75 Fahrenheit

January and February:14 Fahrenheit

March:13 Fahrenheit

April:14 Fahrenheit

May:15 Fahrenheit

June:12 Fahrenheit

July:12 Fahrenheit

August:14 Fahrenheit

September:15 Fahrenheit

October:16 Fahrenheit

November:13 Fahrenheit

December:14 Fahrenheit

Gold

Answer : 212,800,000

BRONZE

___________________________________________________________________

4132 ROUNDED TO THE NEAREST 10 = 4130

4132 ROUNDED TO THE NEAREST 100 = 4100

4132 ROUNDED TO THE NEAREST 1000 = 4000

Bronze

4132 rounded to the nearest thousand is 4000

4132 rounded to the nearest 100 equals 4100

4132 rounded to the nearest 10 equals is 4130

Silver

Average temperature: 63.75 Fahrenheit

January and February:14 Fahrenheit

March:13 Fahrenheit

April:14 Fahrenheit

May:15 Fahrenheit

June:12 Fahrenheit

July:12 Fahrenheit

August:14 Fahrenheit

September:15 Fahrenheit

October:16 Fahrenheit

November:13 Fahrenheit

December:14 Fahrenheit

Gold

Answer : 212,800,000

Bronze

Nearest 10:4130 miles

Nearest 100:4200 miles

Nearest 1000:4000 miles

BRONZE

1. 4132 to the nearest 10 would be 4130 miles

2. 4132 to the nearest 100 would be 4100 miles

3. 4132 to the nearest 1000 would be 4000 miles

silver

The temperature of the pacific ocean is 1.4 degrees celcius /29.5 degrees fahrenheit

GOLD

I knew that 2 x 5 = 10 so from that I figured out that 20% x 5 = 100%. Now that I had worked out what sum I needed to do, I took my 20% ( 106,400,000 square kilometres ) and multiplied it by 5 which gave me my 100% or 532,000,000 square kilometres.

Bronze

The nearest ten is 4130 miles as the unit less than 4.

The nearest hundred is 4100 miles as the ten is less than 4.

The nearest thousand is 4000 miles as the hundred is less than 4.

Gold

The square kilometre of the earth is 42000000km.

Gold

I think the answer is 532000000.

BRONZE

Nearest 10: 4130 miles

Nearest 100: 4100 miles

Nearest 1000: 4000 miles

Gold

The square kilometre of the earth is 21280000km

bronze

the answer to number 1 is 4000

the answer to number 2 is 4100

the answer to numbef 3 is 4130

the answer is 4342 because

all you need to do is add

up the digits.

Gold challenge

Before I got this answer I had to work this out a few times until I got 420,000,00. I Got these answers as I know 20% goes into 100% 5 times so I multiplied 106,400,000 by 5 so I got the answer 42000000km.😄