Addition and Subtraction Concepts

What is the main idea of addition?

• Taking away or decreasing

• Joining, adding, or summing

• Completing or comparing

• Dividing into equal parts

What is the main idea of subtraction?

• Joining or adding

• Multiplying numbers

• Taking away, decreasing, or comparing

• Finding the total

To find the total number of snacks Marta sold, what math operation should be used?

• Subtração

• Multiplicação

• Divisão

• Adição

When adding 325 and 218, what is the sum of the numbers in the units column (5 + 8)?

• 10

• 12

• 13

• 15

In the addition of 325 and 218, when the sum of the units column is 13, what happens to the '1' from '13'?

• It is written in the units column.

• It is carried over to the tens column.

• It is ignored.

• It is subtracted from the next column.

Marta sold 325 snacks on Saturday and 218 on Sunday. How many snacks did she sell in total?

• 533

• 543

• 553

• 563

To find out how many stickers João had left after giving some away, what math operation should be used?

• Addition

• Multiplication

• Subtraction

• Division

In the subtraction of 382 minus 127, what must you do first in the units column (2 - 7)?

• Subtract 2 from 7.

• Borrow from the hundreds column.

• Borrow from the tens column.

• Add 2 and 7.

After borrowing 1 ten from the 8 tens in 382 for the units column, how many tens are left in the tens column?

• 6 tens

• 7 tens

• 8 tens

• 9 tens

João had 382 stickers and gave away 127 repeated ones. How many stickers does he have left?

• 245

• 255

• 265

• 275