Here students can use numbers lines to aid them in the doubling of numbers up to 20.
All questions are presented as addition, for example 8 + 8. There are eight questions altogether, each with its own number line. Learners will practise doubling single and two digit numbers as well as both odd and even numbers. Some numbers require regrouping, for example 17 + 17 but using a number line can eliminate this if preferred.
