Stories for Maths: KS1: Ralf Gets Gardening (Place value (within 10))

"It's a lovely sunny day and Ralf is doing some gardening. He mows the grass, cuts the hedge, and pulls up the weeds. Then he sows his seeds, but every time he turns around, some of them vanish. What is happening to them?

This book aligns with White Rose Maths for Year 1, Place value (within 10), Step 15. The number line.