• Mastery PD Materials

## Composition and calculation: tenths

Spine 1: Number, Addition and Subtraction – Topic 1.23

### Introduction

Introduce children to tenths using both the partitioning structure and ideas of place value; apply additive facts and strategies, including column algorithms, and rounding to numbers with tenths.

### Teaching points

• Teaching point 1: When one is divided into ten equal parts, each part is one tenth of the whole.

• Teaching point 2: Tenths can be expressed as decimal fractions; the number written ‘0.1’ is one tenth; one is ten times the size of 0.1.

• Teaching point 3: We can count in tenths up to and beyond one.

• Teaching point 4: Numbers with tenths can be composed additively and multiplicatively.

• Teaching point 5: Known facts and strategies, including column algorithms, can be applied to calculations for numbers with tenths.

• Teaching point 6: Numbers with tenths can be rounded to the nearest whole number by examining the value of the tenths digit.

• Primary
• KS2
• Year 4