you use multiplication by sevens.
How do you count by sevens
skip all the 8's
7*9 is 63. You can count seven nines or nine sevens, or you can use a calculator.
7,17,27,37,47,57,67,70,71,72,73,74,75,76,77(two sevens),78,79,87,97=20 times
there are four sevens in 28.
How do you count by sevens
If we skip count by 100s 1). 121 is nearer to blank than
you count in twos.
skip all the 8's
7*9 is 63. You can count seven nines or nine sevens, or you can use a calculator.
To count by sevens, start at zero and repeatedly add seven to the previous number. For example, you would count: 0, 7, 14, 21, 28, and so on. You can also express this as a multiplication sequence, where each number is 7 times an integer (0, 1, 2, 3, etc.). This method allows you to efficiently count by sevens up to any desired number.
Why does it say sevens sevens it should say seven sevens.
45
7,17,27,37,47,57,67,70,71,72,73,74,75,76,77(two sevens),78,79,87,97=20 times
There are 12 sevens in 84.
there are four sevens in 28.
10 is important because 10 is a marking place, its easy to count by so you can count faster this is called skip counting