Estimating Addends

Find the Missing Addend

6 + ___ = 15

Sum is

• the answer to an addition problem

• the answer to a multiplication problem

• the answer to a division problem

• the answer to a subtraction problem

In the equation 9 + 7 = 16, 9 and 7 are called __________________.

• multiples

• sum

• factors

• addends

The numbers that are added together in an addition problem are called _________________.

• factors

• multiples

• addends

• estimates

• 400 + 100 = 500
• 400 + 200 = 600
• 400 + 200 = 500
• 300 + 100 = 400

Use mental math to solve.

120 + 42 + 80

Round off the addends to their highest place value and estimate the sum.

287

+464

Round off the addends to their highest place value and estimate the sum.

2,343

+1,585

Round off the addends to their highest place value and estimate the sum.

83

+35

Round off the addends to their highest place value and estimate the sum.

262

+825