Addition & Subtraction of Decimals
3.2 + 1.5
4.7
1/4 + 2/4
3/4
A pack has 6 markers. A teacher buys 5 packs. How many markers?
30 markers
The answer to a multiplication problem is called the ___.
Product
“The decimal 3.40 is the same as 3.4.” — Aiden
Correct
Zeros to the right of a decimal don’t change the value.
7.8 − 2.4
5.4
3/5 − 1/5
2/5
A class has 24 students. They split into groups of 3. How many groups?
24 ÷ 3 = 8 groups
The number being divided in a division problem is the ___.
Dividend
“1/2 + 1/4 = 2/6.” — Bella
Incorrect
Denominators must match → 1/2 = 2/4; 2/4 + 1/4 = 3/4.
12.67 + 3.45
16.12
1 ½ + 2 ⅓
= 3 5/6
A bakery makes 18 trays of muffins. Each tray has 12 muffins. They sell 150 muffins. How many are left?
18×12=216; 216−150= 66 muffins
A number that shows part of a whole is called a ___.
Fraction
“Area and perimeter measure the same thing.” — Jalen
Incorrect
Perimeter = distance around; area = space inside.
9.05 − 4.78
4.27
4 ¼ − 2 ⅔
1 7/12
A store has 45 boxes. Each box holds 8 toys. The toys are packed into bags of 10. How many bags can be made?
45×8=360; 360÷10= 36 bags
A number with a whole part and a fractional part is a ___.
Mixed number
“To subtract mixed numbers, you subtract the whole numbers and the fractions separately.” — Kim
Sometimes correct
Works only if the fractions don’t require borrowing.
Emily ran 2.65 miles on Monday and 3.42 miles on Tuesday. How many miles did she run in total?
2.65 + 3.42 = 6.07 miles
A recipe needs 2 ½ cups of flour and 1 ¾ cups of sugar. How much more flour than sugar is needed?
2.5 − 1.75 = 0.75 = ¾ cup
A gardener plants 15 rows of flowers with 24 flowers in each row. She gives 120 flowers to neighbors. How many remain in the garden?
15×24=360; 360−120= 240 flowers
When solving a problem, the important numbers and words that help you figure out what operation to use are called ___.
Key details or clue words
“In a multi-step problem, I can just add all the numbers I see.” — Derrick
Incorrect
You must use operations that match the situation, not just add.