Multiplication - examples - page 9
- Iron fence
One field of iron fence consists of 20 iron rods with square cross-section of 1.5 cm side and a long 1 meter. How much weight a field if the density of iron is 7800 kg/m3.
Unfold number 4712 in the ratio 10:14:7.
Adult step has a length 71 cm. How many steps will he goes distance 80 meters? How many meters he goes when he makes 1000 steps?
- Unknown number
Samuel wrote unknown number. Then he had add 200000 to the number and the result multiply by three. When it calculated he was surprised, because the result would have received anyway, if write digit to the end of original number. Find unknown number.
- Drunk and alcohol
One drunk measured 2.7 ‰ alcohol in the blood, another 1.75 ‰. How many grams of alcohol in the blood they had if they has 6 kg of blood?
Peter broke the window glass with size 110 cm and 90 cm. 1 square meter of glass costs 8 Euro. How much money is need to pay for a new glass?
- Word problem
384 students were on holiday in Hungary. 146 bought pizza, chips 25 pupils, 39 pupils bought soda, butter 15 pupils, 18 pupils fruits, vegetables 29 students. How much pay for all the food, if every meal cost 4.9 euros?
Michail likes rolls, which cost 12 cents. Previously purchased 7 rolls. How many cents paid Michail for rolls?
How many different committees of 2 people can be formed from a class of 29 students?
The sum and the product of three integers is 6. Write largest of them.
Divide by the number 1.1 is the same as multiply by what number?
- Decimal expansion
Calculate: 5 . 100 + 0 . 1 + 0 . 100000 + 5 . 10 + 8 . 1000 + 8 . 10000 =
How many three-digit natural numbers is greater than 321 if no digit in number repeated?
The man conducting the census asks a woman to age of three daughters. Woman says when multiply the age getnumber 72; if their ages add up, get a number of our house, as you see. The man says: That is not enough to calculate their ages. She says: my oldes
Average of 5 numbers is 135. What is its sum?
- The wall
We have to build a cuboid wall with dimensions base 30 cm and 45 cm and height 3.25 meters. Calculate how many we need bricks if we spend 400 pieces of bricks to 1 m3 of wall?
- Math logic
There are 20 children in the group, each two children have a different name. Alena and John are among them. How many ways can we choose 8 children to be among the selected A) was John B) was John and Alena C) at least one was Alena, John D) maximum one w
Tailor has an estimated 11 meters of 80 cm wide fabric. He will shape wholly 7 rectangles measuring 80 x 150 cm and nothing fabric does not remain. How many fabric he have?
By how many is the difference of numbers 8 and 34 less than its product?
Result of the product of the numbers 5, 1, 7, 2, 6, 1, 0, 6, 6, 5, 1, 9, 6 is: