Reasonableness with Fractions and Decimals 1.Find what whole numbers the first decimal or fraction would be between. 2.Write the two numbers down. For.

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Presentation transcript:

Reasonableness with Fractions and Decimals

1.Find what whole numbers the first decimal or fraction would be between. 2.Write the two numbers down. For Addition

3.Find what whole numbers the second decimal or fraction would be between. 4.Write the two numbers down below the other two.

5. Add the pairs of whole numbers. 6. Work the “real” problem.

7. Make sure your answer is BETWEEN the “answer range” answers. If it IS NOT BETWEEN, your answer is wrong!

2 + 3 What whole numbers is 2 between on a number line?

2 + 3 What whole numbers is 3 between on a number line?

= 1 x 3 x 4

What whole numbers is 4 between on a number line? 4 + 3

What whole numbers is 3 between on a number line?

= 1 x 2

What whole numbers is.075 between on a number line?

What whole numbers is 5.2 between on a number line?

=

=

What whole numbers is between on a number line?

4 is a whole number. Just use 4 both times

=

=

1.Follow steps 1 – 3 from addition. 2.Switch the 2 nd numbers before you write them down. For Subtraction

3.Subtract. If you get the same answer, instead of an “answer range”, you forgot to SWITCH the set of numbers.

4. Work the “real” problem. 5. Make sure your answer is BETWEEN the “answer range” answers.

If it IS NOT BETWEEN, your answer is wrong!

What whole numbers is 3 between on a number line?

What whole numbers is 1 between on a number line?

If you get the same answer, instead of an “answer range”, you forgot to SWITCH the set of numbers.

x 2

What whole numbers is 7 between on a number line? 7 - 2

What whole numbers is 2 between on a number line?

7 - 2 x

What whole numbers is 5.3 between on a number line?

What whole numbers is.086 between on a number line?

=

=

is a whole number. Just use 6 both times

What whole numbers is between on a number line? 66

= 1.369

– 1.375=