Question

A. Fill in the boxes :

8 tens + 19 ones = 9 tens +
ones
8 tens + 2 ones = 7 tens +
ones
7 tens + 25 ones = 9 tens +
ones
70 + 11 = 80 +
50 +
= 60 + 3
90 + 13 =
+ 3​

Answer 1

Explanation:

it's simple:

• 8 tens + 19ones = 9 tens + 9 ones
• 8 tens + 2 ones =7 tens+12 ones
• 7 tens +25 ones = 9 tens + 5 ones
• 70+11=80+1
• 50+13=60+3
• 90+13=100+3