Number Relationships

Big Ideas

Represent decimals through the thousandths using expanded notation and numerals

• Write a challenging number with three numbers to the right of the decimal, such as 1,769,432.158. Ask your child to say the number in unit form. “Say the number using place value units starting from the millions to the thousandths place.” (Answer: 1 million, 7 hundred-thousands, 6 ten-thousands, 9 thousands, 4 hundreds, 3 tens, 2 ones, 1 tenth, 5 hundredths, 8 thousandths.)

Compare/order decimals to the thousandths and represent using the symbols >, <, or =

• Write each of the digits from 0 to 9 on a separate piece of paper. Draw 3 pieces of paper and have your child use the 3 digits to write the least possible decimal number. For example, the least possible decimal number using the digits 9, 1, and 5 is 0.159. Have your student identify the place of each digit in the decimal number (1 in the tenths place, 5 in the hundredths, and 9 in the thousandths).

Round decimals to the tenths or hundredths

• Talk to your child about times that you use rounding, such as estimating how many grocery items you can buy with a $50 bill or how many errands you can get done in 1 hour. Explain your thinking. Have a discussion about times when it makes sense to round and times when it is important to find an exact answer.

Identify prime and composite numbers

Simplify expressions, including those with grouping symbols