Use column addition with regrouping to solve problems | Starter Quiz | Oak National Academy

What is the missing tens digit in the second addend in the column addition?

Answer explanation

7 is the missing tens digit.

What is the missing ones digit in the second addend in the column addition?

Answer explanation

The missing ones digit is 6

What is the sum of the two numbers?

• 105

• 115

• 125

• 135

Answer explanation

The sum of 73 and 52 is 125

What would be a good estimate for the sum of 149 + 152?

• 200

• 300

• 350

• 400

Answer explanation

A good estimate would be 150 + 150 = 300

Which of these calculations would it be more efficient to calculate mentally?

• 648 + 257

• 435 + 285

• 199 + 352

• 320 + 120

Answer explanation

199 + 352 and 320 + 120 would be more efficient to calculate mentally.

Which calculations will give a sum that is even?

• 547 + 325

• 396 + 207

• 485 + 352

• 764 + 188

Answer explanation

547 + 325 and 764 + 188 both have even sums.