A robin swallows around 2 grams of food per day. How much will he consume in a year?
- Between 20 and 100 grams
- Between 100 and 500 grams
- More than 500 grams
This is what we call “having a bird’s appetite”!
How can we also write 25 / 1000?
Little tip to avoid making a mistake: when dividing by 1,000, you must count three digits (as many as there are zeros) after the decimal point. 0.25 is 25/100 (two zeros, therefore two digits after the decimal point) and 0.0025 is 25/10,000 (four zeros, therefore four digits after the decimal point).
A snail always moves at the same speed: it covers the distance of 3 meters every 30 minutes. How far does the snail travel in 3 hours?
- 12 meters
- 18 meters
- 24 meters
An hour is 2 times 30 minutes, so 3 hours is 6 times 30 minutes. Simply multiply the 3 meters traveled per 30 minutes by 6, which gives 18 meters. Yes, it’s not for nothing that we talk about “snail’s pace” when we move very slowly!
In the number 76,851.9548, what is the ones digit?
In decimal numbers, the digits to the left of the decimal point make up the whole part of the number, and the digits to the right of the decimal point make up the decimal part.
What is the quadruple of 6?
There, it’s “as simple as cabbage”: you just have to multiply 6 by 4!
What is the correct spelling for 2280?
- two thousand two hundred eighty
- two thousand two hundred eighty
- two thousand two hundred eighty
“A thousand” is always invariable. “Hundred” agrees in number only when it is not followed by any digit (for example: we write “two hundred” but “two hundred and one”). The same goes for “twenty”, which only takes the plural mark with an “s” when it is multiplied as in “eighty”; it loses this “s” as soon as it is followed by another numeral adjective (for example: we write “eighty” but “eighty-five”). Please note: before “thousand”, “million”, “billion”, which are nouns and not numeral adjectives, the “s” remains. Finally, the hyphen is placed between all the words that make up the number.
Calculate: 2 x 3 + 4 x 5 = …
This calculation involves addition and multiplication, but you must always start by multiplying: these are the operational priorities!
The product is the result:
- From an addition
- From a subtraction
- Of a multiplication
In an addition, the result is the sum and in a subtraction, the result is called the difference.
How many minutes is 7200 seconds equal to?
One hour is 3,600 seconds (60 minutes is 60 times 60 seconds). 7,200 seconds therefore equals two hours, or 120 minutes.
At this school, the number of students increased by 20% this year. Knowing that the number of students this year is 960, how many students were there last year?
An increase of 20% means that for 100 students at the start, there are 20 more, or 120. It is then enough to apply a rule of three: 960 100 / 120 = 800.
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