Children should be well acquainted with multiplying by 10 and 100 in Year 4 and this is extended to multiplying by 1,000 in Year 5. Our latest pages use a range of materials to help, such as place value charts and Gattegno charts. At this stage it is important for children to be aware that multiplying by 100 is the same as multiplying by 10 twice and that multiplying by 1,000 is the same as multiplying by 10 three times.