Erase the Wrong Numbers – Elementary Math

Purpose

To identify numbers written incorrectly and correctly write them.

Overview

Write a row of numbers on the board, including at least three numbers that are backward or upside-down. This time, include some two-digit numbers. Then ask volunteers to erase the numbers that are not correctly written.

wrong numbers

About the sequence

Part 1 involves numbers 0 to 10. Part 2 includes teen numbers up to 20. The Extension moves to include teen numbers other two digit numbers < 100.

Part 1

I’m going to write some numbers on the board. If you see something that doesn’t look correct, raise your hand. (Next invite children to correct each digit written incorrectly).

(Write numbers 0 to 10 in any order, some written backwards or upside-down).

While children are enjoying their building of mastery, feel free to repeat. When children are eager for more, try Part 2.

Part 2

I’m going to write some numbers on the board. (Write a few numbers 0 to 20 in any order). If you see something that doesn’t look correct, raise your hand. (Next invite children to correct each digit written incorrectly).

(Write numbers 0 to 20 in any order, some written backwards or upside-down).

As always, when children seem excited for a new challenge, move on.

Extension

I’m going to write some numbers on the board. (Write a few numbers 0 to 99 in any order). If you see something that doesn’t look correct, raise your hand. (Next invite children to correct each number written incorrectly).

Prompts:

(Write numbers 0 to 99 in any order, some written backwards or upside-down).