Unit 1: Number and place value

Numbers to millions and crore, decimals to thousandths, and efficient methods for all four operations.

• 1.1 Millions, crore and thousandths – From very big to very small.
• 1.2 Mental addition – Large numbers and decimals in your head.
• 1.3 Written addition – Large numbers and decimals in columns.
• 1.4 Mental subtraction – Count up, compensate, use complements.
• 1.5 Written subtraction – Exchange carefully with big numbers and decimals.
• 1.6 Mental multiplication – Double, halve, split and use facts.
• 1.7 Long multiplication – 3-digit × 2-digit numbers on paper.
• 1.8 Factors, multiples and primes – HCF, LCM, squares and cubes.
• 1.9 Divisibility rules – Know without dividing.
• 1.10 Long division – Dividing by 2-digit numbers.
• 1.11 Numbers through history – How people wrote numbers long ago.