Ray's New Primary Arithmetic · Lesson LXIX · Unit 7: Signs, bigger numbers and mixed problems
69. Add, add, then take away
Goal: Your child works a + b + c − d in their head.
You'll need
- A slate, small whiteboard or paper and pencil
What's in the book
A drill such as "How many are 5 + 9 + 8 − 4?" (worked: 18).
The lesson, step by step
One at a time
Say each running total aloud: 5 + 9 = 14, + 8 = 22, − 4 = 18.
Book drill
Work down the page in short rounds.
Afterwards
A few a day.