Find the Missing Addend With Decimals

Start with Add Decimals Mentally to build place value sense, then move to the column sheets. Ask students to write zeros in empty places before adding numbers of different lengths.

Find the missing addend in 24 decimal equations, like the number that adds to 9.73 to make 12.46. A missing addend equals the sum minus the addend you know. The directions on the page read: Write the missing number that makes each equation true. An answer key is included.

Yes, both. We made it for 6th Grade decimal addition & subtraction, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens with add decimals. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.

Lining up the points puts digits of the same place value in the same column, so tenths are added to tenths. On Add Decimals in Columns, 77.64 + 73.259 only works when the 6 sits over the 2 and the 4 sits over the 5.

Subtract the addend you know from the sum. On Find the Missing Addend With Decimals, 9.73 plus a number equals 12.46, so the missing addend is 12.46 − 9.73 = 2.73.

Add the digits in each place separately. On Add Decimals Mentally, 2.2 + 2.07 is 4 ones, 2 tenths and 7 hundredths, or 4.27. A whole number like 4 has its point after the ones digit, so 0.33 + 4 = 4.33.