What is 45 + 55?
What is 45 + 55?
Approach: Sum of units and tens.
100. 40+50=90, 5+5=10.
Follow-up: What is 45 * 55?
Key concepts: number bonds.
What is 45 + 55?
Approach: Sum of units and tens.
100. 40+50=90, 5+5=10.
Follow-up: What is 45 * 55?
Key concepts: number bonds.