Maths practice for 12-year-olds - page 100 of 347
Number of problems found: 6923
- Cube seat fabric
How much fabric will be needed to cover 12 cube-shaped seats with a 40 cm edge? - Cube edge creation From how many cubes with a 4 cm edge can a cube with a 16 cm edge be created?
- Temperature - change
The thermometer showed -2 °C in the morning. By lunch, the temperature had risen by 5 °C. The temperature had dropped by 13 °C till midnight. What temperature in °C did the thermometer show at midnight? - Digit number difference
The digits 1, 2, 4, and 8 form two four-digit numbers so that all 4 digits are used in the notation of each number. Calculate the difference between such largest even number and smallest odd number (in that order). - Number divisor list List all composite positive two-digit numbers whose greatest common divisor with 51 is 17.
- Number divisible list List all divisible numbers by six and seven that are greater than 79 and less than 91.
- Grandma 9
Grandma bought 2 kilograms of apples at a CZK per kilogram, 5 kg of potatoes at b CZK per kilogram, and one celery for 12 CZK. She paid with three fifty-crown coins. ○ Depending on the values a and b, express in CZK the amount of change Grandma received. - Paper collection
A class with m pupils agreed that each pupil would collect k kilograms of paper. Before the collection began, one pupil moved away and did not hand over any paper. o In dependence on the quantities k, m express: a) how many kilograms of paper each pupil h - Number sum comparison
How many times is the number 0.045 greater than the sum of 0.006 and 0.003? - Fraction comparison times
How many times is twice one-third larger than one-ninth? - Difference of squares
How many times is the difference between the squares of numbers 4 and 2 bigger than the square of their difference (in this order)? - Fraction equality box
Write the assignment in a fraction. Fill in the number in the box so that the equality applies: (Write the result as a fraction in the base form.) (1 1/3 - 3/4) · ___ = 1/2 - Fraction equality box Write the assignment in a fraction. Fill in the number in the box so that the equality applies: (Write the result as a fraction in the base form.) 3 · ___ + 1/4 = 5/8
- Number product fraction Write one-sixth product of the numbers 4.8 and 0.4 as a fraction in the basic form.
- Number square comparison
Calculate how many times the square of the number 1/100 is less than 1/1000. (numbers in fraction form) - Number comparison times
Calculate how many times ten-hundredths are less than five-tenths. - Consecutive number smallest The sum of five consecutive natural numbers is 75. What is the smallest of these numbers?
- Bucket
Kim and Joey share a 30-ounce bucket of clay. By the end of the week, Kim has used 3/10 of the bucket. Joey has used 3/5 of the bucket of clay. How many ounces are left in the bucket? - Nina used
Nina used 2 liters of paint to paint a wall. The wall was a rectangle 2 meters high and 4 meters wide. How many liters of paint would she need to paint a rectangular wall which is 2.5 meters high and 8 meters wide? - Ava filled
Ava filled three cups with different amounts of water: 225 ml, 370 ml, and 435 ml. Which of the following is the total amount of water, in liters, that Ava used to fill the three cups?
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