Worksheet: Mental Addition of Numbers up to 1000

In this worksheet, we will practice adding two- and three-digit numbers using mental strategies rather than the column method.

Q1:

Ethan thinks of two different numbers: 437 and 442. What is the total of these numbers?

Q2:

Calculate 676+99.

Q3:

Complete the diagram below by following the arrows.

  • A800, 200, 300
  • B800, 200, 400
  • C600, 100, 500
  • D600, 100, 300

Q4:

320+412=.

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