# Surf for More Math

## Lesson 5 - Estimating Sums and Differences

To encourage your child to have fun on the Web while learning about
Estimating Sums and Differences, here are some games and interactive
activities they can do on their own or in pairs.

**Goal **

Estimate sums and differences of 2-digit numbers.

**Builds Upon **

Student Book pages 90-91

**Instructions for Use **

Estimate
the Sum of 2 Numbers lets your child estimate the sum of 2 numbers.

To use Estimate the Sum of 2 Numbers, click
the 'Start Addition' button and read the equation in the text fields.
Have your child click the button to indicate if your child has the correct
answer.

Estimating
Differences lets your child estimate the difference of 2 numbers.

To use Estimating Differences, click the 'Start
Subtraction' button and read the equation in the text fields. Have your
child click the button to indicate if your child has the correct answer.