Add/Subtract whole numbers & Decimals

Big Ideas

Add and subtract whole numbers and decimals to the thousandths place

Add and Subtract Whole Numbers

• Ask your child creates his/her own word problems. You may need to help your child come up with a context. Help him/her to think of realistic contexts that use large numbers or decimals (e.g., tickets to a concert, miles driven in one year, the cost of a new car, website ‘hits’, number of things made or sold).

Add and Subtract Decimals

• 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.)