human
Recognise and use efficient methods for mental multiplication Tom and Katie are discussing ways to calculate \( 21 \times 12 \) mentally Tom does \( 12 \times 7 \) and then multiplies his answer by \( 3 \) Katie does \( 21 \times 6 \) and then doubles her answer Who would get the correct answer? Only Tom
gpt
Does not correctly apply the distributive property of multiplication