Fractions
Addition Algorithms
For addition - Watch this video to 2:32 (about half way).
When 1 number is near 100 - subtraction (Equal Additions Strategy)
Follow on questions.
1) 36 - 19 =
2) 88 - 34 =
3) 98 - 69 =
4) 41 - 27 =
5) 111 - 39=
When 1 number is near 100 - addition
Follow on questions.
1) 12 + 98 =
2) 94 + 32 =
3) 59 + 35 =
4) 46 + 68 =
5) 59 + 37 =
6) 138 + 28 =