Practice – Break and add number without pencil and paper
Find the answers without writing anything on your notebook. ( Add in your head)
a. 54 + 10 = ?
b. 54 + 15 = ?
c. 54 + 16 = ?
a. 54 + 10 = 64
b. 54 + 15
= 54 + 10 + 5 ( Break 15 into 10 and 5)
= 64 + 5 (Add 54 and 10)
= 69 ( Add 5)
c. 54 + 16
54 + 16
= 54 + 10 + 6 ( Break 16 into 10 and 6)
= 64 + 6 (Add 54 and 10)
= 70 ( Add 6)
Video Explanation:
Find the answers without writing anything on your notebook. ( Add in your head)
a. 32 + 13 = ?
b. 32 + 23 = ?
Click here for the detailed answer. Check only after you have an answer on your notebook.
a. 32 + 13 = 45
b. 32 + 13
= 32 + 10 + 3 ( Break 13 into 10 and 3)
= 42 + 3 (Add 32 and 10)
= 45 ( Add 3)
b. 32 + 23 = 55
b. 32 + 23
= 32 + 20 + 3 ( Break 23 into 20 and 3)
= 52 + 3 (Add 32 and 20)
= 55 ( Add 3)
Video Explanation:
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