Okay, my child is doing problem solving lesson 5-7 in scott foresman addison wesley book. The question that we are having a problem with is a number line. there are 10 spaces in the number line and the clues are:

Question

Okay, my child is doing problem solving lesson 5-7 in scott foresman addison wesley book. The question that we are having a problem with is a number line. there are 10 spaces in the number line and the clues are:

Clue 1: the number are between 70 and 82
Clue 2: the first number has 2 ones

same spaces for second problem.
Clue 1: the numbers are between 30 and 45.
Clue 2: the number before the last number has 2 ones.

any help you can provide would be greatly appreciated.

thanks

Responses

* 2nd grade - bobpursley, Tuesday, January 20, 2009 at 6:21pm

Ok,the first number is 72 (it has two ones), then 73, 74 ...

On the second, the number before the last has to be 42

This is using the unit digit as number Cubes, that is, two ones.

I don't understand the response:
How come the number starts at 72 and not 71?
Also, if the 42 is the next to last number in the number line then what would be the first number?

Answer 1

My child is doing the same worksheet and I have no idea. What does "it has two ones" mean?

Answer 2

I'm suspecting the "two ones" to be adding 1 twice to the number. Such as 70+1+1 = 72

Answer 3

To solve the first problem, we are given two clues:

Clue 1: The numbers are between 70 and 82.
Clue 2: The first number has 2 ones.

To start, we know that the first number has 2 ones, so it cannot be 71. The next number that fits this criteria is 72.

Since the numbers are between 70 and 82, we can continue counting up from 72: 73, 74, 75, 76, 77, 78, 79, 80, 81, 82.

Therefore, the number line would be: 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82.

Now let's move on to the second problem:

Clue 1: The numbers are between 30 and 45.
Clue 2: The number before the last number has 2 ones.

To find the number before the last number, we start by looking for the last number. Since the numbers are between 30 and 45, the last number would be 44.

Now, we need to find the number before 44 that has 2 ones. Starting from 30 and going upwards, we find that the number 42 satisfies this condition.

Therefore, the number line would be: 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44.

I hope this explanation helps!