human
Recognise and use efficient strategies for mental addition This is how Dora calculates the answer to \( 12.3+4.5 \) mentally Dora uses the same method to calculate \( 2.7+35.9 \). Which of the following shows how she would do this? ![A diagram showing 3 thought bubbles from Dora's head. The first bubble says "I added the whole part first 12 + 4 = 16". The second bubble says "I then added the decimal part 0.3 + 0.5 = 0.8". The third bubble says "I then added 16 and 0.8 to get 16.8. So 12.3 + 4.5 = 16.8".]() \( \begin{array}{c}2+35=37 \\ 0.7+0.9=1.6 \\ 37+1.6=37.16\end{array} \)
gpt
Ignores place value when adding a whole number and a decimal