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	1.	Simplifying mathematical challenges grade 4/ Lourdes P. Dela Cruz, Celedonia R. Hermano. by Dela Cruz, Lourdes P [author.] Sosa, Jaimena C [editor.] Lopez, Amelia F [editor.] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Marikina City: InstructionalCoverage System Publishing, Inc., 2012 Availability: Items available for loan: Grade School Library (1)Call number: FIL 510 L86 2012. Place hold Add to cart (remove)
	2.	MATH IN A CHALLENGING WORLD / Ma. Lourdes P. Dela Cruz, Celedonia R. Hermano. by Ma. Lourdes P. Dela Cruz [Author.] Celedonia R. Hermano [Author.] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Marikina City : Instructional Coverage System Publishing, Inc., 2017 Availability: Items available for loan: Grade School Library (1)Call number: FIL 510 D332m 2017. Place hold Add to cart (remove)
	3.	Math in a challenging world teacher's guide 4/ Ma. Lourdes P. Dela Cruz, Celedonia R. Hermano. by Dela Cruz, Ma. Lourdes P [Author.] Lopez, Amelia F [Coordinator.] Canonigo, Allan M [Editor.] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Marikina City : Instructional Coverage System Publishing, Inc., 2017 Availability: Items available for loan: Grade School Library (1)Call number: FIL 510 D332m 2017. Place hold Add to cart (remove)

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