A factor is a number that divides into another number without a remainder. So the factors of 15 are 1, 3, 5 and 15.
The multiples of 4 are all the numbers in the 4 times table. 4,8,12,16,20,24,28,32……..
A prime number is special because it only has 2 factors. These two factors are always 1 and the number itself. So 7 is a prime number because the factors of 7 are 1 and 7.
Answer questions on decimals– choose from addition, multiplication, money, length or place value.
Practice rounding numbers to the nearest 100.
The trick is to look at the tens column. If this is 5 or more, round up. If it is less then 5 the hundreds column stays the same.
So 439 rounds to 400, but 459 rounds up to 500
ESOL students often have great difficulty interpreting questions and working out which operation they should use.Hopefully this exercise will help.
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