20. Intended Learning
Outcome
• Add mentally 2-digit and 1-digit numbers without or with
regrouping using appropriate strategies, focusing on
accuracy and speed in quick mathematical computations.
• Estimate the sum of 3- to 4-digit addends and reflect on
the importance of making reasonable estimates in problem-
solving, much like organizing one’s thoughts before taking
action.
39. Processing Questions:
1.What helped you solve the problem faster—grouping
numbers, visualizing, or something else?
2.How do you think practicing quick mental addition can
help you in your daily activities, like organizing your
time or solving simple problems?"
83. Processing Questions:
1.Why is it important to make a reasonable estimate before
adding large numbers?
2.Can you think of a time when making an estimate helps you plan
better, like knowing how much time you need to complete your
homework?
3.How can estimating help you make better decisions in your daily
life, like knowing how much something will cost or how much