Ray's New Primary Arithmetic by Joseph Ray Ray's New Primary Arithmetic by Joseph Ray    

Lesson 56: Subtract Numbers Up to 70

Directions

Have children complete the steps below.

Have children practice until they perfectly master the task.

Steps

STEP 1

• Have the children write out and complete the subtraction exercises below on paper.

STEP 2

• Assess mastery by reading aloud the listed problems and having the children mentally compute and recite the solutions.
• If children have difficulties, have children redo their written practice with pencil and paper again and then reassess.